In pea plants, yellow seeds are dominant to green. If heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green plants would you expect in F₁ generation ?

(1) 50 : 50

(2) 9 : 1

(3) 1 : 3

(4) 3 : 1

Which one of the following is the most suitable, medium for culture of Drosophila melanogaster ?

(1) Moist bread

(2) Agar agar

(3) Ripe banana

(4) Cow dung

Phenotype of an organism is the result of :

(1) mutations and linkages

(2) cytoplasmic effects and nutrition

(3) environmental changes and sexual dimorphism

(4) genotype and environmental interactions.

In which mode of inheritance do you expect more maternal influence among the offspring ?

(1) Autosomal

(2) Cytoplasmic

(3) Y-linked

(4) X-linked

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

(1) Three

(2) Four

(3) Nine

(4) Two

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

(1) Flower colour in Mirabilis jalapa 

(2) Production of male honey bee

(3) Pod shape in garden pea

(4) Skin colour in humans

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), Yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F₂ generation of the cross RRYY x rryy ?

1. Only round seeds with green cotyledons

2. Only wrinkled with yellow cotyledons

3. Only wrinkled seeds with green cotyledons

4. Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons.

Test cross involves :

(1) crossing between two geneotypes with recessive trait

(2) crossing between two F₁ hybrids

(3) crossing the F₁ hybrid with a double recessive genotype

(4) crossing between two genotypes with dominant trait

Cri-du-chat syndrome in humans is caused by the :

(1) fertilization of an XX egg by a normal Y-bearing sperm

(2) loss of half of the short arm of chromosome 5

(3) loss of half of the long arm of chromosome 5

(4) trisomy of 21st chromosome.

Sickle cell anaemia has not been eliminated from the African population because :

(1) it is controlled by recessive genes

(b) it is not a fatal disease

(3) it provides immunity against malaria

(4) it is controlled by a dominant genes