Can a Woman with Blood Type a Have a Child

Question

Can a woman with blood type A have a child with blood type O?
A) Yes, but only if the father has type O blood.
B) No, this is not possible genetically.
C) No, to have a child with type O blood, the mother must also have type O blood.
D) Yes, but only if the mother is IAIA and the father is IAIO.
E) Yes, but the mother must be IAIO.

Accepted Answer

A woman with blood type A (IAIO) can have a child with blood type O if she carries the IO allele and passes it to her child, and the other parent also contributes an IO allele.