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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 mother must be heterozygous (IAi) for blood type A since she has a daughter with type O. The daughter must inherit an i allele from the mother and an i allele from the father. The son is type B negative, which means he must inherit a B allele from the father and an i allele from the mother. For the Rh factor, since the son is Rh negative, he must inherit an r allele from both parents. Therefore, one possible partial genotype for the son is IBi (blood type B with Rh negative).

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