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 genotype for the mother?
A) Iᴬᴵᴬ
B) Iᴮᴵᴮ
C) ii
D) Iᴬᶦ
E) Iᴬᴵᴮ

Question

Quizplus · Accepted Answer

The mother must have one Iᴬ allele to express the A blood type and one i allele to pass on the O blood type to her daughter. The Rh positive trait indicates she must also carry at least one dominant R allele, making IᴬᶦR the most likely genotype. Choices A, B, C, and E do not account for the ability to produce an O positive child.

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