Can a baby inherit his grandparents blood type?
No. Blood types are inherited in a predictable way. Each person carries two genes for blood type – one from their mom and one from their dad. The possible genes are: A, B, or O. In addition they inherit two genes (one from mom and one from dad) to determine Rh factor. The O gene is recessive, A and B are both dominant. So the possible genes for each blood type are: O blood = OO genes A blood = AO or AA B blood = BO or BB AB blood = AB Rh + is dominant so someone who is Rh+ can carry either two + genes, or a + and a -. A person who is Rh negative carries two – genes. The maternal grandmother had A+, meaning she gave her daughter(the mom) either the gene for A or O. We know she gave her daughter O because the daughter has type B. We further know that the maternal grandfather had either Type B or AB blood. So we know the mom carries the gene BO and either ++ or +-. We know that the dad carries OO– the only genes possible to result in O- blood type. This means that the child of these two
