Question

The ABO blood groups in humans are determined by a multiple-allele system in which IA and IB are codominant and are both dominant to IO. A newborn infant is type A. The mother is type O. Possible phenotypes of the father are:________.

A. A, B, or AB.
B. A, B, or O.
C. O only.
D. A or AB.
E. A or O.

Answer 1

I think it’s B
Or it can C either B or C