Answer
If a mother has type A blood and the father has type B blood, their offspring can have blood types A, B, AB, or O. This is because the mother can pass on the A allele, and the father can pass on the B allele, resulting in the possible combinations of AO, BO, AB, and OO genotypes. Therefore, the offspring can inherit any of these blood types based on the combination of alleles from the parents.
In summary, the possible blood types for the offspring of a mother with type A blood and a father with type B blood are A, B, AB, or O.