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A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?
A
A and B only
B
A, B and AB only
C
A, B, AB and O
D
O only
Detailed Solution
If the parents are heterozygous: man $I^Ai$, woman $I^Bi$.
Gametes: $I^A$, $i$ and $I^B$, $i$.
Offspring: $I^AI^B$ (AB), $I^Ai$ (A), $I^Bi$ (B), $ii$ (O).
So all four blood groups A, B, AB and O are possible.