There are three alleles for blood type, IA and IB are both dominant to iO but IA is not dominant to IB. A man has type O blood. A woman has type A blood but her father had type B blood. If this man and this woman have children what are the possible genotypes of the offspring?

Question

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The man with type O blood has the genotype iOiO. The woman has type A blood but her father had type B blood, indicating she must carry the iO allele (inherited from her type O mother) and an IA allele (to express type A blood), making her genotype IAiO. Their children could inherit iO from both parents (iOiO) or IA from the mother and iO from the father (IAiO).

There Are Three Alleles for Blood Type, IA and IB