What blood type will a child have if one parent has type A blood and the other has type O blood?
Disease description:
May I ask, my wife is 29 years old this year, and she recently became pregnant. I have type A blood, and my wife has type O blood. We would like to know what blood type our child will have.
Doctor's answer (1)
Dr. Liu Feng
Blood type is determined by the genes inherited from both parents. A child born to parents with blood type A and blood type O can have either blood type A or O.
This is because the genetic makeup for blood type A can be either AA or AO, while the genetic makeup for blood type O can only be OO. When an individual with blood type A (whose genotype could be AA or AO) and an individual with blood type O (genotype OO) have a child, the child's blood type depends on the genetic contribution from both parents. Since O is a recessive trait, the child's blood type could be either A (AO) or O (OO). This pattern of inheritance applies to all combinations of blood types.
Therefore, if a parent with blood type A has the genotype AA, the child will definitely have blood type A. If the parent with blood type A has the genotype AO, then the child has a 50% chance of having blood type A and a 50% chance of having blood type O. Hence, a child born to parents with blood types A and O can have only blood type A or O.
