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.


Ans: d. A or AB.

Biology & Microbiology

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