Fruit colour in squash is an example of:

1. Recessive epistasis

2. Dominant epistasis

3. Complementary genes

4. Inhibitory genes

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

1. 25%

2. 0%

3. 50%

4. 75%

Sickle cell anaemia is:

In hexaploid wheat, the haploid (n) ar basic (x) numbers of chromosomes are:

1. n=7 and x=21

2. n=21 and x=21

3. n=21 and x=14

4. n=21 and x=7

Inheritance of skin colour in humans is an example of:

1. chromosomal aberration

2. point mutation

3. polygenic inheritance

4. codominance

Two genes R and Y are located very close on the chromosomal linkage map of the maize plant. When RRYY and rryy genotypes are hybridized, then F₂ segregation will show:

1. higher number of the recombinant types

2. segregation in the expected 9:3:3:1 ratio

3. segregation in a 3:1 ratio

4. higher number of the parental types

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow-seeded plant is crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in F1generation?

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