The ABO blood groups in humans are expressed as the A, B, an…
The ABO blood groups in humans are expressed as the A, B, and i alleles. The A allele encodes the A blood group antigen, B encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (Ai) and a heterozygous blood type B parent (Bi) mate, one quarter of their offspring will have AB blood type (AB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:
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