A man with type B blood marries a woman with type A blood. Their first child has type A blood.

What are the genoptypes of these three individuals? What other genotypes would you expect the offspring of this man and woman to have? What are the frequencies of these genotypes?

The frequencies, ignoring Rh, would be A, AB, AB, B. So 25% A, 25% B, 50% AB.

raz_nat2 was wrong. The man is obviously heterozygous. There's no way to tell, but the woman may be as well, meaning that type O blood is another possibility.

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