Question

One parent is type​ AB; the other parent is type O. A possible genotype for an offspring​ is:

A. AO.
B. OO.
C. AB.
D. None of the above

Answer 1

Someone with blood type AB must have both the A and B alleles. The genotype must be AB. Someone with blood type O has neither the A nor the B allele. The genotype must be OO.