Multiple choice

In human, the ABO blood groups are determined by a multiple allelic system where IA and IB are co-dominant and dominant to IO. A newborn infant is type A, whose mother is type O. Possible phenotypes of the father are

  1. A, B or AB

  2. A, B or O

  3. O only

  4. A or AB
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Possible genotypes of the father are A or AB, as IA allele is required from one of the parent, as mother does not have IA allele, thus father should have IA allele.

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