Question
What could be the blood type of a baby born to an AB-type father and a B-type mother?
Answer
An AB-type father (AO genotype) and a B-type mother (BO genotype) can give birth to a baby with one of the following six possible genotypes: AA, AO, BB, BO, AB, or OO. Therefore, the baby’s blood type could be A, B, AB, or O. If the mother’s genotype is BB, then the baby’s blood type would only be B or AB.