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In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents?

1. IA i (Male) ; IB i (Female)
2. IA i (Male) ; IB IB (Female)
3. IA IA (Male) ; IB IB (Female)
4. IA IA (Male) ; IB i (Female)

Correct answer: IA i (Male) ; IB IB (Female)

Solution

To get only AB or B offspring, the mother must always pass an IB allele, so she must be IBIB. The father must sometimes pass IA (giving AB) and sometimes i (giving B), so he must be IAi.

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