Question

Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood
group respectively. What would be the genotype of both mother and
father?
a. Mother is homozygous for ‘A’ blood group and father is
heterozygous for ‘B’
b. Mother is heterozygous for ‘A’ blood group and father is
homozygous for ‘B’
c. Both mother and father are heterozygous for ‘A’ and ‘B’ blood
group, respectively
d. Both mother and father are homozygous for ‘A’ and ‘B’ blood group,
respectively


NCERT Class XII
Biology - Main Course Book

Chapter 5. Principle of Inheritance and Variation

Answer 1

(c) Both mother and father are heterozygous for ‘A’ and ‘B’ blood
group, respectively is the correct option

Answer 2

From the given option, the correct answer is C

Explanation:

This can be explained with the help of an example illustrated in the following diagram. The  heterozygous blood group has one gene A or B (dominant) and a recessive gene O.

So here the Blood group A is represented as Ao  and B as Bo