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A man with blood type A and a woman with blood type B have three children: a daughter with
type B, and two sons, one with type AB and one with type O. What are the genotypes of the
parents?
Solution
Answer:
Human blood group is determined by multiple allele system, in which IA and IB are co-dominant
to each other and dominant over IO. In the given problem, the possible genotype of father is
IAIO and the possible genotype of the mother is, IBIO. This is because they had children of AB
blood group and O blood group.
IAIO* IBIO -à IAIO (1/4, blood group A), IAIB (1/4, blood group AB), IBIO (1/4, blood group
B), IOIO (1/4, blood group O).

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