Use the following information to answer the questions below.
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
-Which of the following is a possible partial genotype for the son?

Question

Quizplus · Accepted Answer

The son can only receive a B allele from his mother and must be negative for Rh (since the mother only has R alleles but her daughter is Rh+). Therefore, the son's genotype for the ABO blood group is IBi. The question does not provide enough information to determine the son's MN blood group genotype.

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