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 genotype for the son with respect to the A-B-O blood group? (IA= the "A" allele, as if the "I" had a superscript "A"; same for the "IB" allele)
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