Question

If a man having blood group AB marries woman having blood group B, then which of the blood groups is not possible in the progency?

• A. A
• B. B
• C. AB
• D. O

Answer 1

The correct option is D

O

The man has blood group AB, thus its genetope, is $I^A$ $I^B$. The woman has blood group B, thus its genotype can either be $I^B$ $I^B$ or $I^B$ $I^O$.

In any of the case the genotype $I^O$ $I^O$ will not be produced. Thus, none of the offsprings can have O blood group.