Question

Choose the correct option-

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offspring?

• A. O only
• B. A, B, AB, and O
• C. A and B only
• D. Only A

Answer 1

The correct option is B

A, B, AB, and O

The correct option is B.

Explanation of correct option

1. The blood group of the man is A, which means the possible genotypes are I^AI^A or I^Ai. Likewise, the blood group of the woman is B, which means the possible genotypes are I^BI^B or I^Bi.
2. The possible genotypes are summarized in the table below-

	Parent genotype (M,F)	Offspring genotype	Offspring phenotype
Homozygous parents	IAIA, IBIB	IAIB	AB
Heterozygous parents	IAIA, IBi	IAIB, IAi	AB, A
	IAi, IBIB	IAIB, IBi	AB, B
	IAi, IBi	IAIB, IAi, IBi, ii	AB, A, B, O

Final answer: A, B, AB, and O are the possible blood groups of offspring when a man with blood group ‘A’ marries a woman with blood group ‘B’.