Chances for a son or daughter in human birth are……..
a) 3:1 between son and daughter
b) 1:3 between son and daughter
c) 1:1 between son and daughter
d) none of them
The number linkage in man is………
a) 02
b) 23
c) 46
d) 92
Explanation: there are 23 linkage groups in man which is equal to the haploid number of chromosomes.
A man of blood group A marries a woman of blood group B and they have one child. Which one of the following statements about the child’s blood is correct?
a) it could be group A only
b) it could be group AB only
c) it could be group A or group B only
d) it could be any of the groups A, B, AB, O
How many different kinds of gametes will be formed by an individual, who is heterozygous for four gene pairs?
a) 8
b) 16
c) 20
d) 30
A woman with normal colour vision, whose father was red-green colour blind, married a red-green colour-blind. What is the probability of her first-born child being red-green colour-blind?
a) 1.0
b) 0.75
c) 0.50
d) 0.025
Two parents, each of blood groups A, have a daughter of blood group O. what is the probability that their next child who has blood group O?
a) 0.125
b) 0.25
c) 0.50
d) 0.75
