Principle of Inheritance and VariationMediumBloom L3
Question
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings? [NEET 2015 RS]
Options
A.A, B and AB only
B.A, B, AB and O
C.O only
D.A and B only
Solution
Sol.(b) [Key Concept: ABO Blood Groups — A × B Cross All Possibilities] Man with blood group A can be IA IA or IA i; woman with blood group B can be IB IB or IB i. If man is IA i and woman is IB i → offspring: IA IB (AB), IA i (A), IB i (B), ii (O) — ALL FOUR blood groups possible. If man is IA IA × IB i → A and AB only. Since we must consider ALL possible genotype combinations and the question asks for ALL possible blood groups: A, B, AB, and O are all possible. Answer: (b).
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