A man with a blood genotype AO marries a woman with a blood genotype of AO. What blood types could be expected in their children?
A. Type A, only.
B. Type O, only.
C. Both type A and type O.
D. Neither type A nor type O.
The man can give either his A or his O to his child. Same with the woman. The possible combinations of these include: AA, AO, or OO, which amount to blood types A, A, and O, respectively.