Mendel's Law of independent assortment holds good for genes situated on the :

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(a)

non-homologous chromosomes

(b)

homologous chromosomes

(c)

extra nuclear genetic element

(d)

same chromosome

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

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(a)

males and females, respectively

(b)

females and males, respectively

(c)

all males

(d)

all females

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 :

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(a)

quantitative trait

(b)

Mendelian trait

(c)

polygenic trait

(d)

maternal trait

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

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(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 biending

(c)

self pollination of F ₁ offsprings

(d)

cross pollination of parental generations

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

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(a)

phenotypes - 4; genotypes - 16

(b)

phenotypes - 9; genotypes - 4

(c)

phenotypes - 4; genotypes - 8

(d)

phenotypes - 4; genotypes - 9

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?

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(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

Conditions of a karyotype 2n ± 1 and 2n ± 2 are called:

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(a)

Aneuploidy

(b)

Polyploidy

(c)

Allopolyploidy

(d)

Monosomy.

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

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(a)

Autosomal dominant

(b)

Autosomal recessive

(c)

Sex-linked dominant

(d)

Sex-linked recessive.

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

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(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.

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

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(a)

G G G

(b)

A A G

(c)

G A A

(d)

G U G