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Depending on what kind of A the mother is, the baby can be either O or A. If the mother is homozygous A (AA), the child would be A for sure. If the mother is heterozygous A (AO), the child can be either O or A. This is because the A allele is dominant over the O allele, and each person has two alleles for the ABO blood type. The father's O alleles (OO) are recessive so it all depends on the mother.

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16y ago

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