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.Which of the following is a possible phenotype for the father?

Question

Quizplus · Accepted Answer

Since the mother is blood type A positive, she could have the genotype AA or AO. When she has a daughter who is type O positive, this means that the father must have contributed an O allele. Therefore, the father must have the genotype BO or OO.

When the mother has a son who is type B negative, this means that the father must have contributed a B allele and must also be Rh negative (rr genotype), since the son is negative.

Based on this information, the possible genotypes for the father are BOrr or OOrr. Both of these genotypes would result in a phenotype of B negative.

A Woman Who Has Blood Type a Positive Has a Daughter