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A man of A-blood group marries a women of AB blood group. Which type of progeny would indicate that man is heterozygous A?

1. AB
2. A
3. O
4. B

Correct answer: B

Solution

An A-blood-group man can be either AA or AO. If he is heterozygous AO and the mother is AB, they can produce a B child (from O × B), which would be impossible if the father were AA.

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