If a mother has type A blood and the father has type B blood, there are different possible blood types for their offspring. The childs blood type is determined by both parents blood types, as they each pass along one of their two alleles to make up their childs blood type. Based on the ABO blood type chart, if one parent has A and another has B, they can produce a child with A, B, AB, or O blood types. Therefore, 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.