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A man with blood group A marries a women with blood group O and their daughter has blood group O. Is this info enough to tell u which of the traits - blood

group A or O - is dominant? Why or why not?


A person has one of the four blood groups: A, B, AB or O. This blood group system is controlled by a gene which has three different forms denoted by the symbols IA, IB and IO. The genes IA and IB show no dominance over each other, that is, they are co dominant. However, genes IA and IB both are dominant over the gene IO.
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