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If the mother's blood group is A, that means she has a gene for A but not the gene for B. I believe that means that her genotype is either AA or AO. Since the father's blood group is O, he has neither the A gene nor the B gene, so his genotype is OO.

The child gets one gene from each parent. The gene from the father will always be O, since he is OO, while the gene from the mother could be either A or O. Therefore, the child's possible genotypes are AO and OO, meaning her blood group is either A or O.

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17y ago

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Could a father with a blood group ab have a child that is O blood group?

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