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no Yes. If the mother's phenotype is A, the mother's genotype may be AA or AO.

If the mother's phenotype is A, the mother's genotype may be AA or AO.

If both are AO, the baby may inherit O from both parents, and the baby's genotype will be OO, and the phenotype will be O.

A baby born to two parents who are genotype AO can have the following genotypes: AA, AO, OO. The possible phenotypes are therefore A or O.

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15y ago
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14y ago

The dad may be O...but maybe not. It used to be believed that was the end of the story. But they now know that the blood type can be carried down from anywhere in the gene pool...which is why further testing is done for paternity. It goes much deeper than basic ABO and Rh type. In other words the great grandmother or the great great grandfather (on either side) may have been O and the father could be a B

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Q: Son is O positive and mommy is A positive what is the dad?
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