A person with blood type AB and a person with blood type O can only have children with blood types A or B. The mother with type O blood can only pass on the i allele (the O gene), while the father with type AB blood can pass on either the A or the B allele. Since the A and B alleles are dominant over the O allele, the offspring will express either blood type A (genotype IAi) or blood type B (genotype IBi).
If a person with blood type AB marries a person with blood type O. What blood types are possible in their children?
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