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?

Question

Quizplus · Accepted Answer

Since the mother has blood type A, she must have at least one dominant allele for A (Iᴬ). Since her daughter is type O and her son is type B, she must also have a recessive allele for O (i) and a dominant allele for B (Iᴮ). The mother is Rh-positive, so she must have at least one dominant allele for Rh (R). For the MN blood group, we cannot determine the mother's genotype with the given information. 
Therefore, the only genotype that fits all of the given information is Iᴬi for the mother.

Use the Following Information to Answer the Questions Below