Patient's question:
Is the blood type of a girl determined by the father or the mother? What about boys?Previous treatment history and effectiveness: ............................
What kind of assistance is desired: .........................
Doctor's answer:
The blood type of a child is determined by both parents. To illustrate this in a simple way:1. If both parents have blood type A or both have blood type B, then their child's blood type may be either A or O (if both parents have blood type B, it would be either B or O), with a probability ratio of 3:1 for A to O.
2. If one parent has blood type A (or B) and the other has blood type O, then the ratio of their child's blood type being A to O is 2:1.
3. If one parent has blood type AB and the other has blood type O, then their child's blood type will either be A or B (it can never be AB).