A man with blood group AB marries a woman with blood group O. Which of the following blood groups is IMPOSSIBLE among their children?
AA only
BB only
CAB or OCORRECT
DA or B
GCEBiologyGenetics and Variation2023
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Why the answer is C, and why the others tempt you.
A man with blood group AB has genotype I^A I^B, and a woman with blood group O has genotype ii. Their offspring can only be I^A i (blood group A) or I^B i (blood group B). It is impossible for children to have blood group AB (requires I^A I^B) or blood group O (requires ii), making option C correct.
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