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The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes theA blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If aheterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, onequarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally.Therefore, ABO blood groups are an example of:a. multiple alleles and incomplete dominanceb. codominance and incomplete dominancec. incomplete dominance onlyd. multiple alleles and codominance

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