The possible blood types of the offspring are:ABABOEach parent can pass one of two alleles to the child. If the mother has type A, her genotype could be AA or AO. If the father has type B, his genotype could be BB or BO. The combinations can result in any of the four blood types.Example combinations:A (from mom) + B (from dad) = ABA + O = AB + O = BO + O = OSo, all four blood types (A, B, AB, O) are possible.