S2

//M1//QN1//MCQ//DL0

Conditions of a karyotype 2n + 1, 2n – 1 and 2n + 2, 2n – 2 are called _______ .

(A) Aneuploidy (B) Polyploidy (C) Allopolyploidy (D) Monosomy

//X

(A) Aneuploidy

//M1//QN2//MCQ//DL0

All genes located on the same chromosome _______ .

(A) Form different groups depending upon their relative distance. (B) Form one linkage group. (C) Will not form any linkage groups. (D) Form interactive groups that affect the phenotype.

//X

(B) Form one linkage group.

//M1//QN3//MCQ//DL0

Distance between the genes and percentage of recombination shows _______ .

(A) a direct relationship (B) an inverse relationship (C) a parallel relationship (D) no relationship

//X

(A) a direct relationship

//M1//QN4//MCQ//DL0

Which of the following will not result in variations among siblings?

(A) Independent assortment of genes (B) Crossing over (C) Linkage (D) Mutation

//X

(C) Linkage

//M1//QN5//MCQ//DL0

In sickle cell anaemia, glutamic acid is replaced by valine. Which one of the following triplets codes for valine?

(A) G G G (B) A A G (C) G A A (D) G U G

//X

(D) G U G

//M1//QN6//MCQ//DL0

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease

is _______ .

(A) Autosomal dominant (B) Autosomal recessive (C) Sex-linked dominant (D) Sex-linked recessive

//X

(D) Sex-linked recessive

//M1//QN7//MCQ//DL0

Person having genotype IA IB would show the blood group AB. This is because of _______.

(A) Pleiotropy (B) Co-dominance (C) Segregation (D) Incomplete dominance

//X

(B) Co-dominance

//M1//QN8//MCQ//DL0

ZZ / ZW type of sex determination is seen

in _______ .

(A) Platypus (B) Snails (C) Cockroach (D) Peacock

//X

(D) Peacock

//M1//QN9//MCQ//DL0

A cross between two tall plants resulted in offsprings having few dwarf plants. What would be the genotypes of both the parents?

(A) TT and Tt (B) Tt and Tt (C) TT and TT (D) Tt and tt

//X

(B) Tt and Tt

//M1//QN10//MCQ//DL0

In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that _______ .

(A) The alleles of two genes are interacting with each other. (B) It is a multigenic inheritance. (C) It is a case of multiple allelism. (D) The alleles of two genes are segregating independently.

//X

(D) The alleles of two genes are segregating independently.

//M1//QN11//MCQ//DL0

Two genes 'A' and 'B' are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?

(A) 1 : 1 : 1 : 1 (B) 9 : 3 : 3 : 1 (C) 3 : 1 (D) 1 : 1

//X

(D) 1 : 1

//M1//QN12//MCQ//DL0

Mother and father of a person with 'O' blood group have 'A' and 'B' blood group, respectively. What would be the genotype of both mother and father?

(A) Mother is homozygous for 'A' blood group and father is heterozygous for 'B'. (B) Mother is heterozygous for 'A' blood group and father is homozygous for 'B'. (C) Both mother and father are heterozygous for 'A' and 'B' blood group, respectively. (D) Both mother and father are homozygous for 'A' and 'B' blood group, respectively.

//X

(C) Both mother and father are heterozygous for 'A' and 'B' blood group, respectively.

//M1//QN13//MCQ//DL0

Occasionally, a single gene may express more than one effect. The phenomenon is called _______.

(A) multiple allelism (B) mosaicism (C) pleiotropy (D) polygeny

//X

(C) pleiotropy

//M1//QN14//MCQ//DL0

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to _______.

(A) Quantitative trait (B) Mendelian trait (C) Polygenic trait (D) Maternal trait

//X

(B) Mendelian trait

//M1//QN15//MCQ//DL0

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on

the _______ .

(A) results of F3 generation of a cross. (B) observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending. (C) self pollination of F1 offsprings. (D) cross pollination of F1 generation with recessive parent.

//X

(B) observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.

//M1//QN16//MCQ//DL0

In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are _______ .

(A) phenotypes - 4; genotypes - 16 (B) phenotypes - 9; genotypes - 4 (C) phenotypes - 4; genotypes - 8 (D) phenotypes - 4; genotypes - 9

//X

(D) phenotypes - 4; genotypes - 9

//M1//QN17//MCQ//DL0

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome bearing organisms are _______ .

(A) males and females, respectively (B) females and males, respectively (C) all males (D) all females

//X

(A) males and females, respectively

//M1//QN18//MCQ//DL0

Mendel’s Law of independent assortment holds good for genes situated on the _______.

(A) non-homologous chromosomes (B) homologous chromosomes (C) extra nuclear genetic element (D) same chromosome

//X

(B) homologous chromosomes

//M1//QN19//MCQ//DL0

Who believed that 'factors' are responsible for hereditary information?

(A) Mendel (B) Johannsen (C) Bateson and Punnet (D) Morgan

//X

(A) Mendel

//M1//QN20//MCQ//DL0

Mendel's factors, the carriers of heredity information are known as 'genes' a term coined by :

(A) Bateson (B) Johannsen (C) Morgan (D) Tschermak

//X

(B) Johannsen

//M1//QN21//MCQ//DL0

Mendelism is related with .

(A) Heredity in living beings. (B) Meiosis during sexual reproduction (C) Mutation in living organisms (D) Crossing over and linkage

//X

(A) Heredity in living beings.

//M1//QN22//MCQ//DL0

The first great "geneticist" was ________.

(A) Engler (B) Mendel (C) Bateson (D) Boveri

//X

(B) Mendel

//M1//QN23//MCQ//DL0

Through artificial selection and domestication from ancestral wild cows, we have well-known Indian breeds, e.g., Sahiwal cows which belongs to which state?

(A) Punjab (B) Gujarat (C) Rajasthan (D) Uttar Pradesh

//X

(A) Punjab

//M1//QN24//MCQ//DL0

Mating between two individual differing in genotypes to produce genetic variation is called

(A) Domestication (B) Introduction (C) Hybridisation (D) Mutation

//X

(C) Hybridisation

//M1//QN25//MCQ//DL0

Mendel did his work on ________.

(A) Pisum sativum (B) Drosophila melanogaster (C) Mirabilis jalapa (D) Lathyrus odoratus

//X

(A) Pisum sativum

//M1//QN26//MCQ//DL0

In Mendel's monohybrid experiment, how many different characters are selected to carry out similar experiments?

(A) 2 (B) 4 (C) 7 (D) 1

//X

(D) 1

//M1//QN27//MCQ//DL0

Which of the parental plants Mendel has selected for his experiments ?

(A) Heterozygous and pure (B) Homozygous and mixed (C) Homozygous and pure (D) Heterozygous and mixed

//X

(C) Homozygous and pure

//M1//QN28//MCQ//DL0

In a monohybrid cross of Mendel, the different phenotypes available in F1 generation

are ________.

(A) pure, tall (B) mixed, dwarf (C) heterozygous, tall (D) heterozygous, dwarf

//X

(C) heterozygous, tall

//M1//QN29//MCQ//DL0

How many different types of plants are formed in F2 progeny obtained from self-pollination of a F1?

(A) 1 (B) 2 (C) 4 (D) 16

//X

(B) 2

//M1//QN30//MCQ//DL0

First generation after a cross is

(A) First filial generation (B) F1 generation (C) Second filial generation (D) Both A and B

//X

(D) Both A and B

//M1//QN31//MCQ//DL0

Mendel is famous for his work on

(A) Pisum (B) Drosophila (C) Neurospora (D) Oenothera

//X

(A) Pisum

//M1//QN32//MCQ//DL0

Mendel was lucky because.

(A) Pisum sativum is a long lived plant (B) Pisum sativum shows more contrasting character. (C) The genes for different characters are located on different chromosomes in Pisum sativum (D) The Pisum sativum is short-lived plant.

//X

(C) The genes for different characters are located on different chromosomes in Pisum sativum

//M1//QN33//MCQ//DL0

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits ?

(A) 8 (B) 4 (C) 2 (D) 14

//X

(D) 14

//M1//QN34//MCQ//DL0

Number of linkage group in Pisum sativum is

(A) 2 (B) 5 (C) 7 (D) 9

//X

(C) 7

//M1//QN35//MCQ//DL0

Mendel chose the pea plant to study genetics because of many qualities. One of them which he did not consider was _______ .

(A) Plant height (B) Plant colour (C) Pod shape (D) Pod colour

//X

(B) Plant colour

//M1//QN36//MCQ//DL0

Mendel's law of heredity can be explained with the help of _______ .

(A) Mitosis (B) Meiosis (C) Both mitosis and meiosis (D) None of the above

//X

(B) Meiosis

//M1//QN37//MCQ//DL0

When an allele fails to explain itself in the presence of other allele, the former is said to be _______ .

(A) Recessive (B) Dominant (C) Codominant (D) Complementary

//X

(A) Recessive

//M1//QN38//MCQ//DL0

Allele is the _______ .

(A) Alternate trait of gene pair (B) Total number of genes for a trait (C) Total number of chromosomes (D) Total number of chromosomes of a haploid set

//X

(A) Alternate trait of gene pair

//M1//QN39//MCQ//DL0

Genotype-Phenotype concept was first produced by _______ .

(A) Bateson (B) Johannsen (C) Sutton & Boveri (D) Punnett

//X

(B) Johannsen

//M1//QN40//MCQ//DL0

Mendel chose pea plants because _______ .

(A) They were cheap. (B) They were having seven pairs of contrasting characters. (C) They were easily available. (D) They were of great economic importance.

//X

(B) They were having seven pairs of contrasting characters.

//M1//QN41//MCQ//DL0

Two pea plants were subjected to cross pollination of the 183 plants produced in the next generation. 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants were likely to be :

(A) TT and tt (B) Tt and Tt (C) Tt and tt (D) TT and TT

//X

(C) Tt and tt

//M1//QN42//MCQ//DL0

In a monohybrid cross between two heterozygous individuals, the number of pure homozygous individuals obtained in F1 generation is :

(A) 2 (B) 4 (C) 6 (D) 8

//X

(A) 2

//M1//QN43//MCQ//DL0

What will be the genotypes of parental generation, if all progeny obtained in F1 were recessive and dwarf:

(A) TT and tt (B) tt and tt (C) tt and Tt (D) Tt and Tt

//X

(B) tt and tt

//M1//QN44//MCQ//DL0

What is a dominant gene?

(A) Both the genes expresses their expression together. (B) The allele which expresses it character. (C) The allele which remains unexpressed. (D) Multiple effect of a single gene.

//X

(B) The allele which expresses it character.

//M1//QN45//MCQ//DL0

The allele which is not expressed is called :

(A) Recessive gene (B) Dominant gene (C) Homozygous gene (D) Co-dominant gene

//X

(A) Recessive gene

//M1//QN46//MCQ//DL0

Both the genes of a character are identical

is _______ .

(A) Homozygous (B) Heterozygous (C) Dominant (D) Co-dominant

//X

(A) Homozygous

//M1//QN47//MCQ//DL0

Which option is true for test - cross?

(A) Tt × Tt (B) TT × TT (C) Tt × tt (D) tt × tt

//X

(C) Tt × tt

//M1//QN48//MCQ//DL0

Both the genes of character are unlike in: _______

(A) Homozygous (B) Incomplete dominant (C) Heterozygous (D) Co-dominant

//X

(C) Heterozygous

//M1//QN49//MCQ//DL0

A cross, arranged for deciding whether an organism is homozygous or heterozygous is :

(A) Epistasis (B) Test-cross (C) Back cross (D) Monohybrid-cross

//X

(B) Test-cross

//M1//QN50//MCQ//DL0//EQ

The results obtained from self- fertilization amongst F1 individuals in Mendel's Monohybrid cross is :

(A) Dominant and Recessive (C) Dominant and Recessive (D) Dominant and Recessive

//X

(A)

Dominant and

Recessive

//M1//QN51//MCQ//DL0

The phenotype and genotype ratios of test-cross is:

(A) 3 : 1 and 1 : 1 (B) 1 : 1 and 3 : 1 (C) 1 : 1 and 1 : 1 (D) 9 : 3 and 3 : 1

//X

(C) 1 : 1 and 1 : 1

//M1//QN52//MCQ//DL0

If homozygous recessive parent crosses with homozygous dominant parent, then what will be the result ?

(A) 100% heterozygous dominant progeny (B) 50% dominant and 50% recessive progeny (C) 70% dominant and 25% recessive progeny (D) 70% dominant and 30% recessive progeny

//X

(A) 100% heterozygous dominant progeny

//M1//QN53//MCQ//DL0

Heterozygous tall plant (Tt) is crossed with homozygous dwarf (tt) plant. Then what will be the result ?

(A) All progeny will be (Tt) tall (B) 50% Tt and 50% tt progeny (C) 70% TT and 30% tt progeny (D) 75% Tt and 25% tt progeny

//X

(B) 50% Tt and 50% tt progeny

//M1//QN54//MCQ//DL0

Incomplete dominance can be studied through experiments on :

(A) Sweet pea (B) Dog flower (C) Drosophila (D) E.Coli

//X

(B) Dog flower

//M1//QN55//MCQ//DL0

What is phenotypic and genotypic ratio of incomplete dominance in F2 ?

(A) 3 : 1 and 1 : 2 : 1 (B) 1 : 2 : 1 and 1 : 2 : 1 (C) 3 : 1 and 3 : 1 (D) 1 : 2 : 2 and 1 : 1

//X

(B) 1 : 2 : 1 and 1 : 2 : 1

//M1//QN56//MCQ//DL0

When homozygous red flowered and homozygous white flowered are crossed all offsprings in F1 generation are.

(A) Pink (B) White (C) Red (D) All of above

//X

(A) Pink

//M1//QN57//MCQ//DL0

In Mirabilis a plant with RW is crossed with RW then the expected percentage value of red, pink and white is. (R = Red, W = White)

(A) 25% 50%, 25% (B) 25%, 25%, 50% (C) 10%, 20% 70% (D) 50% 25%, 25%

//X

(A) 25% 50%, 25%

//M1//QN58//MCQ//DL0

In Mirabilis, a hybrid with pink (RW) flower is crossed with white flower (WW), then the expected phenotypic and genotypic ratio

is ________.

(A) Phenotype: Red White, Genotype : RR, WW (B) Phenotype : Pink, Pink, Genotype : RW RW (C) Phenotype: Pink, White, Genotype : RW, WW (D) Phenotype : White, White, Genotype : WW, WW

//X

(C) Phenotype: Pink, White, Genotype : RW, WW

//M1//QN59//MCQ//DL0

In which case dominant and recessive alleles lack their dominant and recessive

relationships?

(A) Incomplete dominance (B) Polygenic inheritance (C) Co-dominance (D) Dominance

//X

(C) Co-dominance

//M1//QN60//MCQ//DL0

A child's blood group is ‘O’ The parents' blood groups cannot be

(A) A and B (B) AB and O (C) A and A (D) B and O

//X

(B) AB and O

//M1//QN61//MCQ//DL0

A child of O-group has B-group father. The genotype of father will be

(A) IOIO (B) IBIB (C) IAIB (D) IBIO

//X

(D) IBIO

//M1//QN62//MCQ//DL0

A man of A-blood group marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?

(A) AB (B) A (C) O (D) B

//X

(D) B

//M1//QN63//MCQ//DL0

ABO blood groups are controlled by which gene?

(A) A (B) I (C) B (D) C

//X

(B) I

//M1//QN64//MCQ//DL0

Co-dominance refers to the condition

where F1 :

(A) resembles the dominant parent (B) is in-between the parents (C) resembled the recessive parents (D) resembles both the parents

//X

(D) resembles both the parents

//M1//QN65//MCQ//DL0

What does blending inheritance refer to?

(A) Mixed characters in an offspring (B) Dominant character (C) Recessive character (D) Dominant & recessive character

//X

(A) Mixed characters in an offspring

//M1//QN66//MCQ//DL0

ABO blood group system is due to

(A) multifactor inheritance (B) incomplete dominance (C) multiple allelism (D) epistasis.

//X

(A) multifactor inheritance

//M1//QN67//MCQ//DL0

Which gene produce antigen for blood group?

(A) I (B) i (C) A (D) B

//X

(A) I

//M1//QN68//MCQ//DL0

Inheritance of blood type in humans is the example of ________.

(A) multiple alleles (B) co-dominance (C) polygenic inheritance (D) incomplete dominance

//X

(A) multiple alleles

//M1//QN69//MCQ//DL0

Which gene shows co-dominance for producing antigen?

(A) IAIA or IAi (B) IBIB or IBi (C) IAIB (D) ii

//X

(C) IAIB

//M1//QN70//MCQ//DL0

Who described human blood groups?

(A) Morgan (B) Landsteiner (C) Devenport (D) Mended

//X

(B) Landsteiner

//M1//QN71//MCQ//DL0

Which condition decided blood group in human beings?

(A) Antigen types on RBCs (B) Antibody in blood plasma (C) Antigen types in blood plasma (D) A and B both

//X

(D) A and B both

//M1//QN72//MCQ//DL0

Which blood group has antibody 'a' as well as antibody 'b'?

(A) A (B) AB (C) B (D) O

//X

(D) O

//M1//QN73//MCQ//DL0

If the mother and father have 'O' blood group, then what will be probable blood group of the child?

(A) O (B) O, A (C) O, B (D) A, B

//X

(A) O

//M1//QN74//MCQ//DL0

If mother has O blood group and father has A blood group then what will be the probable blood group of the child?

(A) A, B, AB (B) O, A (C) B, O (D) AB, O

//X

(B) O, A

//M1//QN75//MCQ//DL0

If mother has O blood group and father has B blood group then what will be probable blood group of the child?

(A) A, B, O (B) A, O (C) O, B (D)AB AB

//X

(C) O, B (D)AB AB

//M1//QN76//MCQ//DL0

What will be the probable blood group of parents having children sequencely A and O blood group?

(A) A, A (B) A, B (C) B, AB (D) A, AB

//X

(A) A, A

//M1//QN77//MCQ//DL0

What will be the probable blood group of parents having children sequencely A, B, AB and O blood groups?

(A) A, B (B) A, AB (C) B B (D)AB,AB

//X

(A) A, B

//M1//QN78//MCQ//DL0

What will be the probable blood group of a couple having three children with blood group sequencely A, B and AB?

(A) A, B (B) B, B (C) A, AB (D) AB, O

//X

(C) A, AB

//M1//QN79//MCQ//DL0

A couple has two sons. Out of the two, one son has B blood group and another has O blood group, then what is the probable blood group of the couple?

(A) AB. O (B) B, B (C) AB, AB (D) A, B

//X

(B) B, B

//M1//QN80//MCQ//DL0

A woman with blood group O has a child with blood group O. She claims that a man with blood group 'A' is the father of her child. What would be the genotype of the father, if her claim is right?

(A) IOIO (B) IAIB (C) IAi (D) IAIA

//X

(C) IAi

//M1//QN81//MCQ//DL0

For a child having blood group B, if father has blood group A, what may be the blood group of mother?

(A) B or AB (B) O or A (C) A or B (D) AB or A

//X

(A) B or AB

//M1//QN82//MCQ//DL0

A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend ?

(A) Type A (B) Type A (C) Type AB (D) Type O

//X

(D) Type O

//M1//QN83//MCQ//DL0

If a child has O type of blood group and father has B type, the genotype of the father will be :

(A) IOIO (B) IAIB (C) IOiB (D) IBIB

//X

(C) IOiB

//M1//QN84//MCQ//DL0

The genotypes of a husband and wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

(A) 3 genotypes; 4 phenotypes (B) 4 genotypes. 3 phenotypes (C) 4 genotypes, 4 phenotypes (D) 3 genotypes, 3 phenotypes

//X

(C) 4 genotypes, 4 phenotypes

//M1//QN85//MCQ//DL0

Test cross is shown by _______ .

(A) Tt × Tt (B) Tt × TT (C) TT × TT (D) Tt × tt

//X

(D) Tt × tt

//M1//QN86//MCQ//DL0

Complete dominance is absent in

(A) Pisum sativum (B) Mirabilis jalapa (C) Lathyrus odoratus (D) Oenothera lamarckiana

//X

(B) Mirabilis jalapa

//M1//QN87//MCQ//DL0

If a mother has 'O' blood group, the foetus would die if the blood group of foetus is

(A) A (B) B (C) AB (D) Would remain unaffected by blood group whether it is A, B or AB

//X

(D) Would remain unaffected by blood group whether it is A, B or AB

//M1//QN88//MCQ//DL0

In one cross between red flower and white flower, the offsprings have red flower in majority and white flowers are much less, then in the cross, red colour character is

(A) Dominant (B) Assorted (C) Recessive (D) Hybrid

//X

(A) Dominant

//M1//QN89//MCQ//DL0

Organims that are phenotypically similar but genotypically different are said to be

(A) Heterozygous (B) Monozygous (C) Multizygous (D) Homozygous

//X

(A) Heterozygous

//M1//QN90//MCQ//DL0

Parents of blood group O and AB cannot have a child of group AB because:

(A) Gene O is dominant over gene A (B) Gene O is dominant over gene B (C) Gene A or B is absent in one of the parents. (D) Gene A and B are absent in one of the parents.

//X

(D) Gene A and B are absent in one of the parents.

//M1//QN91//MCQ//DL0

Which one of the following is a hereditary character of blood?

(A) Blood group (B) Haeme (C) Nucleus (D) None of the above

//X

(A) Blood group

//M1//QN92//MCQ//DL0

Three children in a family have blood types O, AB and B respectively. What are the genotypes of their parents ?

(A) IAi and IBi (B) IAIB and ii (C) IBIB and IAIA (D) IAIA and IBi

//X

(A) IAi and IBi

//M1//QN93//MCQ//DL0

A child of a mother with blood group A and a father with blood group AB may have any one of the following blood groups except :

(A) A (B) B (C) AB (D) O

//X

(D) O

//M1//QN94//MCQ//DL0

Blood grouping in humans is controlled by

(A) 4 alleles in which IA is dominant (B) 3 alleles in which IA and IB are dominant (C) 2 alleles in which none is dominant (D) 3 alleles in which IA is recessive

//X

(B) 3 alleles in which IA and IB are dominant

//M1//QN95//MCQ//DL0

Which of the following is the significance of dominance?

(A) Organisms with dominant genes are more vital (B) Harmful mutations are not expressed due to dominant gene (C) Heterosis is due to the dominant gene (D) All of the above

//X

(B) Harmful mutations are not expressed due to dominant gene

//M1//QN96//MCQ//DL0

From a single ear of corn, a farmer planted 200 kernels which produced 140 tall & 40 short plants. The genotypes of these offsprings are most likely to be _______ .

(A) TT, tt (B) TT, Tt, tt (C) TT, Tt (D) Tt, tt

//X

(B) TT, Tt, tt

//M1//QN97//MCQ//DL0

A useful process for determining whether an individual is homozygous or heterozygous is

(A) Cross-breeding (B) Self-fertilization (C) Back-crossing (D) Test cross

//X

(D) Test cross

//M1//QN98//MCQ//DL0

Heterozygous tall plants were crossed with dwarf plants. What will be the ratio of dwarf plants in the following progeny?

(A) 50% (B) 25 % (C) 75% (D) 100%

//X

(A) 50%

//M1//QN99//MCQ//DL0

In the Mirabilis plant the appearance of the pink hybrid (Rr) between a cross of a red (RR) and white (rr) flower parent

indicates _______ .

(A) Segregation (B) Dominance (C) Incomplete dominance (D) Heterosis

//X

(C) Incomplete dominance

//M1//QN100//MCQ//DL0

The longer the chromosome of an organism, the more genetic variability it gets from, _______ .

(A) Independent assortment (B) Linkage (C) Crossing over (D) Mutation

//X

(C) Crossing over

//M1//QN101//MCQ//DL0

A cross between hybrid and a parent is known as _______ .

(A) Test cross (B) Back cross (C) Monohybrid cross (D) Reciprocal cross

//X

(B) Back cross

//M1//QN102//MCQ//DL0

Checkerboard method of calculations was developed by _______ .

(A) Mendel (B) Bateson (C) Punnett (D) Morgan

//X

(C) Punnett

//M1//QN103//MCQ//DL0

ABO blood groups are controlled by the

gene _______ .

(A) ABO (B) O (C) I (D) i

//X

(C) I

//M1//QN104//MCQ//DL0

In case of incomplete dominance in F2 generation _______ .

(A) Genotypic ratio is 3 : 1 (B) Phenotypic ratio is 3 : 1 (C) Genotypic ratio = phenotypic ratio (D) Nothing can be concluded

//X

(C) Genotypic ratio = phenotypic ratio

//M1//QN105//MCQ//DL0

When Mendel crossed true breeding white-flowered strain of peas with a true breeding red-flowered strain, individuals in the F2 represented _______ .

(A) white-flowered plants (B) red-flowered plants (C) red-flowered and white-flowered plants in the ratio 3 : 1 (D) red and white-flowered individuals in the ratio 1 : 1

//X

(C) red-flowered and white-flowered plants in the ratio 3 : 1

//M1//QN106//MCQ//DL0

A test cross is carried out to _______ .

(A) determine the genotype of a plant at F2 (B) predict whether two traits are linked (C) assess the number of alleles of a gene (D) determine whether two species or varieties will breed successfully

//X

(A) determine the genotype of a plant at F2

//M1//QN107//MCQ//DL0

Mother and father both have blood group 'A'. They have two children one with blood group 'O' and second one with blood group' A'. They have _______ .

(A) mother has homozygotic gene father has heterozygote I'A I A (B) both are homozygotic (IA IA) (C) mother is heterozygotic (IAi) and father is homozygotic (IA IA) (D) both are heterozygotic (IAi)

//X

(D) both are heterozygotic (IAi)

//M1//QN108//MCQ//DL0

A cross between one tall plant and one dwarf plant resulted in offspring having tall plants. What would be the genotype of offsprings?

(A) TT (B) Tt (C) tt (D) All of the above

//X

(B) Tt

//M1//QN109//MCQ//DL0

Mendel crossed a pure white-flowered recessive pea plant with a dominant pure red-flowered plant. The first generation of hybrids from the cross should show _______.

(A) 50% white-flowered and 50% red-flowered plants (B) all red-flowered plants (C) 75% red-flowered and 25% white-flowered plants (D) all white-flowered plants

//X

(B) all red-flowered plants

//M1//QN110//MCQ//DL0

Match the following :

Column I		Column II
1	Inheritance of two genes	a	ABO blood group
2	Incomplete dominance	b	1 : 2 : 1
3	Codominance	c	9 : 3 : 3 : 1
4	Inheritance of one gene	d	3 : 1

(A) 1 – c, 2 – a, 3 – b, 4 – d (B) 1 – c, 2 – b, 3 – d, 4 – a (C) 1 – c, 2 – b, 3 – a, 4 – d (D) 1 – c, 2 – d, 3 – a, 4 – b

//X

(C) 1 – c, 2 – b, 3 – a, 4 – d

//M1//QN111//MCQ//DL0

Test cross involves

(A) crossing between two genotypes with dominant trait (B) crossing between two genotypes with recessive trait (C) crossing between two F1 hybrids (D) crossing the F1 hybrid with a double recessive genotype.

//X

(D) crossing the F1 hybrid with a double recessive genotype.

//M1//QN112//MCQ//DL0

Universal donors have no antigens in RBC and have both a and b antibodies. They belong to blood group _______ .

(A) A (B) B (C) AB (D) O

//X

(D) O

//M1//QN113//MCQ//DL0

A person with blood group 'A' can be given blood of which blood group?

(A) A and B (B) B and O (C) A and O (D) A, B, AB

//X

(C) A and O

//M1//QN114//MCQ//DL0

Which one of the following blood groups belongs to the category of universal recipient?

(A) AB (B) A (C) B (D) O

//X

(A) AB

//M1//QN115//MCQ//DL0

Phenotypic ratio 3:1 proves _______ .

(A) Dominance (B) Segregation (C) Crossing over (D) Independent Assortment

//X

(B) Segregation

//M1//QN116//MCQ//DL0

A child with mother of B blood group and father of AB group blood group, will not have which blood group?

(A) A (B) B (C) AB (D) O

//X

(D) O

//M1//QN117//MCQ//DL0

When dominant and recessive alleles express themselves together, it is called _______ .

(A) Dominance (B) Co-dominance (C) Amphidominance (D) Pseudodominance

//X

(B) Co-dominance

//M1//QN118//MCQ//DL0

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?

(A) A, B, AB and O (B) O only (C) A and B only (D) A, B and AB only

//X

(A) A, B, AB and O

//M1//QN119//MCQ//DL0

When a cross is made between offspring and its parents, it is known as _______ .

(A) monohybrid cross (B) dihybrid cross (C) back cross (D) reciprocal cross

//X

(C) back cross

//M1//QN120//MCQ//DL0

Which of the following is genotypic ratio of F2 Mendel's monohybrid cross?

(A) 1 : 3 (B) 3 : 1 (C) 1 : 2 : 1 (D) 1 : 1 : 1 : 1

//X

(C) 1 : 2 : 1

//M1//QN121//MCQ//DL0

Blood group of the father is A and blood group of mother is B. Then predict the blood group of the progeny.

(A) A, AB (B) A, B, AB, O (C) B, AB (D) A, B, AB

//X

(B) A, B, AB, O

//M1//QN122//MCQ//DL0

Genotype of blood group 'A' will be

(A) IAIA (B) IBIB (C) IAIA or IAIO (D) IAIO

//X

(C) IAIA or IAIO

//M1//QN123//MCQ//DL0

A child's blood group is 'O'. The parents blood groups cannot be _______ .

(A) AB and O (B) B and O (C) A and B (D) A and A

//X

(A) AB and O

//M1//QN124//MCQ//DL0

In a family, the father has a blood group ‘A’ and the mother has a blood group ‘B’, Children show 50% probability for a blood group “AB” indicate that _______ .

(A) father is heterozygous (B) mother is heterozygous (C) either of the parent is heterozygous (D) mother is homozygous

//X

(C) either of the parent is heterozygous

//M1//QN125//MCQ//DL0

How many different kind of phenotypic form will be obtained if we arrange Mendel's dihybrid experiment result in Punnett 16 square boxes?

(A) 8 (B) 4 (C) 2 (D) 16

//X

(B) 4

//M1//QN126//MCQ//DL0

How many different genotypic forms of four different kinds of phenotypic plants will be obtained in F2 generation of Mendel's dihybrid experiment?

(A) 16 (B) 4 (C) 8 (D) 9

//X

(D) 9

//M1//QN127//MCQ//DL0

How many genotypes of RrYy are there in F2 generation of dihybrid experiment ?

(A) 3 (B) 2 (C) 4 (D) 9

//X

(C) 4

//M1//QN128//MCQ//DL0

How many genotypes of rryy are obtained in F2 generation of dihybrid experiment?

(A) 1 (B) 4 (C) 2 (D) 3

//X

(A) 1

//M1//QN129//MCQ//DL0

What type of gametes will be formed by genotype RrYy?

(A) RY, Ry, rY, ry (B) RY, Ry, ry, ry (C) Ry, Ry, ry (D) Rr, RR, Yy, YY

//X

(A) RY, Ry, rY, ry

//M1//QN130//MCQ//DL0

In dihybrid cross, the factor for yellow colour assorts out independently of the factors for :

(A) Green colour (B) Round shape (C) Wrinkle shape (D) Long shape

//X

(B) Round shape

//M1//QN131//MCQ//DL0

In order to calculate map distance of genes on a chromosomes, one must know the

(A) Number of mutant genes (B) Recombination frequency of each gene locus (C) Cross over percentage (D) Non-cross over percentage

//X

(C) Cross over percentage

//M1//QN132//MCQ//DL0

What will be the number of linkage groups in maize if it has 10 pairs of chromosomes?

(A) 5 (B) 10 (C) 0 (D) 20

//X

(B) 10

//M1//QN133//MCQ//DL0

Distance between two linked genes on a chromosome measured in cross over units, is

(A) Ratio of crossing over between them (B) Cross-over value (C) Number of other genes between them (D) None of these

//X

(B) Cross-over value

//M1//QN134//MCQ//DL0

When the tall plants with red flowers were crossed with dwarf plants having white flowers, Mendel found the ratio of progeny is

(A) 1 : 2 : 1 (B) 3 : 1 (C) 9 : 3 : 3 : 1 (D) 1 : 4 : 6 : 4 : 1

//X

(C) 9 : 3 : 3 : 1

//M1//QN135//MCQ//DL0

Mendel's law of independent assortment is applicable for

(A) All genes in all organism (B) All genes of pea plant only (C) All linked genes only (D) All non-linked genes only

//X

(D) All non-linked genes only

//M1//QN136//MCQ//DL0

In Mendelian, linkage was not observed due to

(A) Mutation (B) Independent assortment (C) Synapsis (D) Crossing over

//X

(B) Independent assortment

//M1//QN137//MCQ//DL0

In a dihybrid cross between RRYY and rryy, the number of RrYy F2 genotypes will

be _______ .

(A) 4 (B) 3 (C) 2 (D) 9

//X

(A) 4

//M1//QN138//MCQ//DL0//EQ

The map distance between genes A and B is 3 units, between B and C 10 units and between C and A, 7 units. The order of the genes in a linkage map constructed on the above data would perhaps be _______ .

(A) A, B, C (B) A, C, B (C) B,C, A (D) B,A, C

//X

(D) B,A, C

//M1//QN139//MCQ//DL0

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by _______ .

(A) T.H. Morgan (B) Gregor J. Mendel (C) Alfred Sturtevant (D) Sutton Boveri

//X

(C) Alfred Sturtevant

//M1//QN140//MCQ//DL0

If haploid chromosome number in a cell is 12. The monosomic number will be _______ .

(A) 24 (B) 21 (C) 25 (D) 23

//X

(D) 23

//M1//QN141//MCQ//DL0

Experimental verification of the chromosomal theory of inheritance was done by _______ .

(A) Morgan (B) Mendel (C) Sutton (D) Boveri

//X

(A) Morgan

//M1//QN142//MCQ//DL0

Mendel's law of independent assortment is based on F2 ratio of _______ .

(A) 1 : 2 : 1 (B) 9 : 3 : 3 : 1 (C) 2 : 1 (D) 3 : 1

//X

(B) 9 : 3 : 3 : 1

//M1//QN143//MCQ//DL0

In maize, chromosome number is 2n = 20. The number of linkage groups in it shall

be _______ .

(A) 20 (B) 40 (C) 10 (D) 5

//X

(C) 10

//M1//QN144//MCQ//DL0

What is the ratio of homozygous plants for both dominant characters in F2 of a dihybrid cross?

(A) 1/16 (B) 3/16 (C) 4/16 (D) 9/16

//X

(A) 1/16

//M1//QN145//MCQ//DL0

1: 1: 1: 1 ratio shows _______ .

(A) Monohybrid cross (B) Dihybrid cross (C) Back cross (D) Dihybrid test cross

//X

(D) Dihybrid test cross

//M1//QN146//MCQ//DL0

Types of phenotypes of the F2 generation of dihybrid cross?

(A) 4 (B) 16 (C) 8 (D) 9

//X

(A) 4

//M1//QN147//MCQ//DL0

Genetic recombinations occur through

(A) Mitosis & fertilization (B) Mitosis & Meiosis (C) Meiosis & fertilization (D) None

//X

(C) Meiosis & fertilization

//M1//QN148//MCQ//DL0

Which of the following is the unit of inheritance?

(A) Phenotype (B) Genotype (C) Gene (D) Genome

//X

(C) Gene

//M1//QN149//MCQ//DL0

If there were only parental combinations in F2 generation of a dihybrid cross then Mendel might have discovered :

(A) Independent assortment (B) Atavism (C) Linkage (D) Repulsion

//X

(C) Linkage

//M1//QN150//MCQ//DL0

If the distance between the genes on the chromosome is more, then the gene shows _______ .

(A) less linkage (B) strong linkage (C) weak linkage (D) incomplete linkage

//X

(C) weak linkage

//M1//QN151//MCQ//DL0

Which of the following conditions represents a case of codominant genes?

(A) A gene expresses itself, suppressing the phenotypic effect of its alleles. (B) Genes that are similar in phenotypic effect when present separately, but together interact to produce a different trait. (C) Alleles, both of which interact to produce an effect in homozygous condition. (D) Alleles, both of which interact to produce an independent effect in heterozygous conditions.

//X

(D) Alleles, both of which interact to produce an independent effect in heterozygous conditions.

//M1//QN152//MCQ//DL0

Crossing over during meiosis occurs between

(A) Sister chromatids (B) Non-sister chromatids (C) Centromeres (D) Non-homologous chromosomes

//X

(B) Non-sister chromatids

//M1//QN153//MCQ//DL0

Incomplete linkage in Drosophila produces offsprings with parental and non-parental combinations. State the percentage of the non-parental combination in Drosophila.

(A) 83% (B) 17 % (C) 15 % (D) 85 %

//X

(B) 17 %

//M1//QN154//MCQ//DL0

What does the term recombination describe?

(A) Generation of non-parental gene combination (B) Generation of parental gene combination (C) Generation of internal gene combination (D) All of the above

//X

(A) Generation of non-parental gene combination

//M1//QN155//MCQ//DL0

In T. H. Morgan’s Experiment on Drosophila, what will be the result when F1 female flies are crossed with double recessive male flies?

17% recombinations

58.5% recombinations

40% recombinations

10% Recombinations

(A) 83% parental combinations (B) 41.5% parental combinations (C) 60% parental combinations (D) 90% parental combinations

//X

(A) 83% parental combinations

//M1//QN156//MCQ//DL0

Which cross yielded a ratio of 7:1 :1:7?

(A) Test cross (Dihybrid) – Bateson and Punnet (B) Test cross (Monohybrid) – Bateson and Punnet (C) Test cross (Dihybrid) – Carrel Correns (D) Test cross (Dihybrid) – Mendel & Morgan

//X

(A) Test cross (Dihybrid) – Bateson and Punnet

//M1//QN157//MCQ//DL0

An exception to Mendel's law is _______ .

(A) law of independent assortment (B) law of segregation (C) law of dominance (D) law of linkage

//X

(D) law of linkage

//M1//QN158//MCQ//DL0

When there is no possibility of an independent assortment of genes during gametogenesis then what will be the real ratio of F2 in dihybrid cross?

(A) 9 : 3 : 3 : 1 (B) 11 : 1 : 1 : 3 (C) 12 : 1 : 1 : 2 (D) 9 : 3 : 2 : 2

//X

(B) 11 : 1 : 1 : 3

//M1//QN159//MCQ//DL0

What was the expected ratio of F2 by Bateson and Punnett in their dihybridization experiment done on Lathyrus odoratus?

(A) 9 : 3 : 3 : 1 (B) 11 : 1 : 1 : 3 (C) 12 : 1 : 1 : 3 (D) 9 : 3 : 2 : 2

//X

(A) 9 : 3 : 3 : 1

//M1//QN160//MCQ//DL0

If a plant heterozygous for tallness is selfed, the F2 generation has both tall and dwarf plants. This proves the principle of _______ .

(A) Dominance (B) Segregation (C) Independent assortment (D) Incomplete dominance

//X

(B) Segregation

//M1//QN161//MCQ//DL0

A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is _______ .

(A) 1 : 2 : 1 (B) 3 : 1 (C) 1 : 1 : 1 : 1 (D) 9 : 3 : 3 : 1

//X

(C) 1 : 1 : 1 : 1

//M1//QN162//MCQ//DL0

A human male produces sperms with the genotypes AB, Ab, aB, ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

(A) AaBB (B) AABb (C) AABB (D) AaBb

//X

(D) AaBb

//M1//QN163//MCQ//DL0

On selfing a plant of F1-generation with genotype "AABbCC', the genotypic ratio in F2-generation will be

(A) 3 : 1 (B) 1 : 1 (C) 9 : 3 : 3 : 1 (D) 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

//X

(A) 3 : 1

//M1//QN164//MCQ//DL0

In human beings, multiple genes are involved in the inheritance of _______.

(A) sickle-cell anaemia (B) skin colour (C) colour blindness (D) phenylketonuria

//X

(B) skin colour

//M1//QN165//MCQ//DL0

How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AABbCc?

(A) Six (B) Nine (C) Two (D) Four

//X

(D) Four

//M1//QN166//MCQ//DL0

The polygenic genes show

(A) different karyotypes (B) different genotypes (C) different phenotypes (D) none of these

//X

(C) different phenotypes

//M1//QN167//MCQ//DL0

A polygenic inheritance in human beings is

(A) skin colour (B) phenylketonuria (C) colour blindness (D) sickle cell anaemia

//X

(A) skin colour

//M1//QN168//MCQ//DL0

Inheritance of skin colour in humans is an example of

(A) point mutation (B) polygenic inheritance (C) codominance (D) chromosomal aberration

//X

(B) polygenic inheritance

//M1//QN169//MCQ//DL0

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

(A) Two (B) Three (C) Four (D) Nine

//X

(A) Two

//M1//QN170//MCQ//DL0

Which one of the following is an example of polygenic inheritance?

(A) Skin colour in humans (B) Flower colour in Mirabilis jalapa (C) Production of male honeybee (D) Pod shape in garden pea

//X

(A) Skin colour in humans

//M1//QN171//MCQ//DL0

What is called pleiotropism?

(A) Phenomenon of multiple effects of a single gene (B) Phenomenon of multiple effects of multiple genes (C) Phenomenon of multiple effects of multiple alleles (D) all of the above

//X

(A) Phenomenon of multiple effects of a single gene

//M1//QN172//MCQ//DL0

A pleiotropic gene is one which _______ .

(A) affects one character (B) affects more than one characters (C) and (B) both (D) None of these

//X

(B) affects more than one characters

//M1//QN173//MCQ//DL0

A pleiotropic gene _______ .

(A) controls a trait only in combination with another gene. (B) controls multiple traits in an individual. (C) is expressed only in primitive plants. (D) is a gene evolved during pliocene.

//X

(B) controls multiple traits in an individual.

//M1//QN174//MCQ//DL0

XO type of sex determination can be found in:

(A) Birds (B) Grasshoppers (C) Monkeys (D) Drosophila

//X

(B) Grasshoppers

//M1//QN175//MCQ//DL0

In human being sex chromosomal complement is _______ .

(A) XX – XY (B) XX – XO (C) ZO – ZZ (D) ZW – ZZ

//X

(A) XX – XY

//M1//QN176//MCQ//DL0

Which one of the following conditions correctly describes the manner of determining the sex?

(A) Homozygous sex chromosomes (ZZ) determine female sex in birds. (B) XO type of sex chromosomes determine male sex in grasshopper. (C) XO condition in humans as found in Turner’s syndrome determines female sex. (D) Homozygous sex chromosomes (XX) produce males in Drosophila.

//X

(B) XO type of sex chromosomes determine male sex in grasshopper.

//M1//QN177//MCQ//DL0

What type of sex determination is observed in grasshopper?

(A) XX - XY type (B) XX - XO type (C) ZZ - ZW type (D) ZZ - ZO type

//X

(B) XX - XO type

//M1//QN178//MCQ//DL0

Drosophila flies with one half of the body male and other half female is referred to as

(A) Gynandromorph (B) Hermaphrodite (C) Super female (D) Intersex

//X

(A) Gynandromorph

//M1//QN179//MCQ//DL0

The average ratio of male to female individuals based on XX and XY type of sex determination in total world of human population is

(A) 3 : 1 (B) 1 : 3 (C) 1 : 4 (D) 1 : 1

//X

(D) 1 : 1

//M1//QN180//MCQ//DL0

It is a mutagen.

(A) Cold (B) Heat (C) Water (D) UV radiation

//X

(D) UV radiation

//M1//QN181//MCQ//DL0

The character of organisms is said to be sex linked when its gene is carried on _______ .

(A) Y chromosomes (B) X chromosome of male or female (C) X and Y chromosomes (D) A particular autosome

//X

(B) X chromosome of male or female

//M1//QN182//MCQ//DL0

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in

(A) One-third of the progenies (B) None of the progenies (C) All the progenies (D) Fifty percent of the progenies

//X

(B) None of the progenies

//M1//QN183//MCQ//DL0

The most striking example of point mutation is found in a disease called

(A) Down's syndrome (B) Sickle cell anaemia (C) Thalassemia (D) Night blindness

//X

(B) Sickle cell anaemia

//M1//QN184//MCQ//DL0

A man who carries a sex linked gene on his Y chromosome will transmit this gene to ______.

(A) half of his sons (B) half of his daughters (C) all his sons (D) all his daughters

//X

(C) all his sons

//M1//QN185//MCQ//DL0

Euploidy is best explained by

(A) Exact multiples of a haploid set of chromosomes (B) One chromosome less than the haploid set of chromosome (C) One chromosome more than the haploid set of chromosomes (D) One chromosome more than the diploid set of chromosome

//X

(D) One chromosome more than the diploid set of chromosome

//M1//QN186//MCQ//DL0

XO-chromosomal abnormality in human beings causes.

(A) Turner's syndrome (B) Down's syndrome (C) Klinefelter's syndrome (D) None of these

//X

(A) Turner's syndrome

//M1//QN187//MCQ//DL0

A couple has four daughters. The percentage probability of the fifth child to be a daughter

is _______ .

(A) 10 (B) 50 (C) 75 (D) 100

//X

(B) 50

//M1//QN188//MCQ//DL0

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

(A) 50% (B) 25% (C) 100% (D) no chance

//X

(B) 25%

//M1//QN189//MCQ//DL0

Sex linked disease is _______ .

(A) Haemophilia (B) Colour blindness (C) Sickle-cell anaemia (D) Both (A) and (B)

//X

(D) Both (A) and (B)

//M1//QN190//MCQ//DL0

If a colourblind lady marries a normal man, their children will be _______ .

(A) Normal daughters and normal sons (B) Normal sons and carrier daughters (C) Colourblind sons and carrier daughters (D) Colourblind sons and colourblind daughters

//X

(C) Colourblind sons and carrier daughters

//M1//QN191//MCQ//DL0

A woman with two genes for haemophillia and one gene for colour blindness on one of the X chromosomes marries a normal man. How will the progeny be?

(A) All sons and daughters will be haemophillic and colourblind. (B) Haemophillic and colourblind daughters. (C) 50% haemophillic colourblind sons and 50% normal sons. (D) 50% haemophillic daughters and 50% colourblind daughters.

//X

(C) 50% haemophillic colourblind sons and 50% normal sons.

//M1//QN192//MCQ//DL0

If a normal woman marries a colourblind man, then their _______ .

(A) all sons will be colourblind and daughters normal (B) all daughters will be colourblind and sons normal (C) all children will be normal (D) all children will be colourblind

//X

(C) all children will be normal

//M1//QN193//MCQ//DL0

Haemophilia is :

(A) Autosomal (B) Y-linked (C) Z-linked (D) X-linked

//X

(D) X-linked

//M1//QN194//MCQ//DL0

If a haemophilic man marries a woman carrier (heterozygous) for haemophilia, what would be the possibility that their daughter to be haemophilic?

(A) 100% (B) 75% (C) 50% (D) 0%

//X

(C) 50%

//M1//QN195//MCQ//DL0

In which of the following colour blindness is inherited?

(A) In males only (B) In females only (C) In both males and females (D) In none of the above

//X

(C) In both males and females

//M1//QN196//MCQ//DL0

All sons of a couple are colourblind

because _______ .

(A) mother is homozygous colourblind (B) mother is heterozygous and father normal (C) mother is heterozygous and father colourblind (D) mother is normal and father colourblind

//X

(A) mother is homozygous colourblind

//M1//QN197//MCQ//DL0

A colourblind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colourblind?

(A) Nil (B) 0.25 (C) 0.5 (D) 1

//X

(B) 0.25

//M1//QN198//MCQ//DL0

Which one of the following is a genetically transmitted character?

(A) Colour blindness (B) Hydrocephalus (C) Hemophilia (D) All of these

//X

(D) All of these

//M1//QN199//MCQ//DL0

In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes?

(A) 22 pairs + XXY males (B) 22 pairs + XX females (C) 22 pairs + XXYY females (D) 22 pairs + Y females

//X

(A) 22 pairs + XXY males

//M1//QN200//MCQ//DL0

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having blindness ?

(A) 50% (B) 75% (C) 100% (D) 25%

//X

(C) 100%

//M1//QN201//MCQ//DL0

Carrier of genes of colour blindness are present in :

(A) Father (B) Mother (C) Father and mother (D) None

//X

(B) Mother

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In a cross between a male and female, both heterozygous are sickle cell anaemia gene, what percentage of the progeny will be diseased?

(A) 50 (B) 75 (C) 25 (D) 100

//X

(C) 25

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Number of sex chromosomes is normal in

(A) Super females (B) Turner's syndrome (C) Klinefelter's syndrome (D) Down's syndrome

//X

(D) Down's syndrome

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Colour blindness is found more in males than in females because :

(A) The males containing the single affected X-chromosome are colour blind (B) Heterozygous females are colour blind (C) Males having affected Y-chromosome are colour blind (D) Affected X-chromosome has much higher affinity to Y-chromosome ans compared to unaffected chromosomes to exhibit the same.

//X

(A) The males containing the single affected X-chromosome are colour blind

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A normal woman, whose father was colour-blind is married to a normal man. The sons would be :

(A) All normal (B) All color blind (C) 75% colour blind (D) 50% colour blind

//X

(D) 50% colour blind

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A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

(A) 25 (B) 0 (C) 50 (D) 75

//X

(C) 50

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A normal woman whose father was colourblind marries a normal man. What kinds of children would be expected and in what proportion ?

(A) Daughters normal, 50% of sons colourblind (B) Daughters normal, all sons colourblind (C) 50% of daughters colourblind, all sons normal (D) All daughters colourblind, sons normal

//X

(A) Daughters normal, 50% of sons colourblind

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The amino acid substituted in sickle cell anaemia is

(A) Glutamic acid for valline in the alpha chain (B) Glutamic acid for valline in the beta chain (C) Valine for glutamic acid in the alpha chain (D) Valine for glutamic acid in the beta chain.

//X

(D) Valine for glutamic acid in the beta chain.

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Albinism is

(A) Hereditary character (B) Non-hereditary character (C) Sex-linked character (D) Acquired character

//X

(A) Hereditary character

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The number of chromosomes in Tuner's syndrome is

(A) 45 (B) 43 (C) 44 (D) 42

//X

(A) 45

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Haemophilic female marries normal male, the theoretical ratio of their offsprings regarding haemophilia will be

(A) All offsprings are haemophilic (B) All girls are haemophilic (C) All sons are haemophilic (D) Half daughters and halfsons are haemophilic

//X

(C) All sons are haemophilic

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Haemophilia is a

(A) Deficiency disorder (B) Y-linked disorder (C) X-Linked recessive disorder (D) Autosomal recessive

//X

(C) X-Linked recessive disorder

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Colour blindness in man is

(A) Due of deficiency of VitaminA (B) Due of absence of visual purple in retina (C) Due to absence of rods in retina (D) A sex linked abnormality

//X

(D) A sex linked abnormality

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Colour blindness is caused by a single _______.

(A) Dominant gene in woman (B) Dominant gene in man (C) Recessive gene in man (D) Recessive gene in woman

//X

(C) Recessive gene in man

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Which one is a sex-linked disease?

(A) Tylosis (B) Beri-beri (C) Colour blindness (D) Albinism

//X

(C) Colour blindness

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A normal woman whose father was colourblind, is married to a normal man. The sons would be _______ .

(A) 75% colour blind (B) 50% colour blind (C) all normal (D) all colour blind

//X

(B) 50% colour blind

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The traits controlled by the genes located on X chromosome of human beings are said to

be _______ .

(A) Sex linked (B) Sex influenced (C) Sex limited (D) None of these

//X

(A) Sex linked

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Assertion : Phenylketonuria is a recessive hereditary disease caused by body's failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme. Reason : It results in the presence of phenylpyruvic acid in urine.

(A) Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion (B) Both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. (C) The Assertion is correct but reason is incorrect. (D) Both the Assertion and reason are incorrect.

//X

(B) Both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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Assertion : Colour blindness occurs about 0.4 percent in the females. Reason : Red-green colour blindness gene is present in the X-chromosome.