The AB blood group of humans is an example of
- A. incomplete dominance
- B. sex linkage
- C. codominance
- D. epistasis
Explanation
A person of group AB makes both the A antigen and the B antigen on the red cell surface, so neither allele is diluted or masked and both are expressed fully at the same time. That is codominance, not incomplete dominance, which would give a single intermediate antigen instead of two separate ones. Both alleles are dominant to the recessive O allele.
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