Can a mother with A+ blood type and a father with B+ blood type make an O+ baby?”
A person inherits two genes that determine blood type—one from her mother, and one from her father. There are three possible types—A, B, and O. Here’s a list of what the baby’s blood type will be with various combinations: OO = O AA = A AO = A BB = B BO = B AB = AB Because O is recessive and A and B are dominant, both parents could be carrying an O form of the gene without it being apparent (AO mother and BO father, for example). If their baby inherited the O from each of them, the baby would have an O blood type.
