A woman heterozygous for A blood marries a man heterozygous for B blood.

What is the probability that they will produce offspring with AB blood?

a) 0%

b) 25%

c) 50%

d) 75%

b) 25% is the right answer

Explanation:

A woman heterozygous for A blood group with genotype = Iᵃi

A man heterozygous for A with genotype = Iᵇi

so after cross between Iᵃ i x Iᵇ i

alleles man woman

Iᵃ i

Iᵇ IᵃIᵇ Iᵇi

i Iᵃi ii

so the offspring will be

25 % AB IᵃIᵇ 25 % A Iᵃi

25 % B Iᵇi 25 % O ii