Question

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

A

AB

B

A

C

O

D

B

Hard
Solution
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Correct option is D)

Genotype of a heterozygous man with A blood group II and that of a homozygous man with A blood group II
A cross between heterozygous man with A blood group and woman of AB blood group produce progeny with A, AB and B blood groups. 
Gametes
II
II
 I I
 I  II  II
 I  II 
  II
On the other hand, a cross between homozygous man with A blood group, II and woman of AB blood group, I produce progeny with A, AB blood groups, none of the child will have B blood group. 
Gametes
II
II
 II
 I  II  II
 I II 
  II 
Hence, a child with B blood group would indicate that man is heterozygous A. 
Thus, the correct answer is option D.

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