Eye colour in humans is controlled by a single pair of gene where B i.e. brown is dominant to b i.e. blue. What will be the genotype of a brown eyed man who marries a blue eyed lady and has blue eyed child?

a. BB

b. Bb

c. BB and Bb

d. bb

if two brown eyed people marry each other and each one had one blue eyed parent. What is the proportion of eye colour in their offspring?

a. 3:1

b. 1:4

c. 1:2

d. 2:2

In dogs, dark coat colour (A) is dominant to albino (a) and short hair (L) is dominant to long hair (l). Determine the probable genotype of the parent who are dark and short and have progenies in the following ratio:

Dark and short-89

Dark and long -31

Albino and short- 29

Albino and long-11

a. AaLl

b. AALL

c. AaLL

d. AAll

If fruit weight in a plant was measured and following categories were obtained- 25g;30g;35g;40g;45g;50g;55g.Then, how many genes are involved for controlling fruit weight?

a. 2

b. 3

c. 5

d. 7

If a character is controlled by 5 alleles, what will be the number of genotype in this case?

1. 12
2. 18
3. 30
4. 15

What phenotypic ratio will be there when selfing of a trihybrid is performed in which two gene pairs are completely dominant and one gene pair is codominant?

1. 3:9:1:2:1:3
2. 27:9:3:1:3:3:1
3. 9:3:3:1:18:6:6:2:9:3:3:1
4. 18:6:6:2:1:2:1:2:1

If dihybrid mulatto male (AaBb) is crossed with white female(aabb), then the ratio of mulatto and white offspring will be-

1. 1:6
2. 1:1
3. 4:1
4. 2:1

In a test cross of F1 generation, having a genotype AaBb, following progeny were obtained

AaBb- 450

aabb – 450

Aabb- 50

aaBb- 50

How far in centimorgans are the a and b genes?

a.100

b.90

c.10

d.1

The distance between gene A, B, C and D on a chromosome is as follows:

A and C - 18 units

A and B - 26 units

A and D - 40 units

B and C - 8 units

B and D – 14 units

The sequence of these genes would be-

1. ABCD
2. ACBD
3. ADCB
4. ACDB

Which of the following is an autosomal recessive blood disease?

1. Phenylketonuria
2. Thalassemia
3. Haemophilia
4. Muscular dystrophy