The ABO blood groups in humans are determined by a multiple-allele system in which I^A and I^B are codominant and are both dominant to I^O.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.

Question

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The father must have at least one I^A allele to have a type A child. Since the mother is type O, she can only contribute I^O alleles. Therefore, the father must have the genotype I^AI^O (type A) or I^AI^B (type AB).

The ABO Blood Groups in Humans Are Determined by a Multiple-Allele