An example of codominance is______________?
Correct answer: D. AB' blood group
- A. A' blood group
- B. B' blood group
- C. O' blood group
- D. AB' blood group
Explanation
AB blood group demonstrates codominance because IA and IB alleles are both expressed in the phenotype, producing both A and B antigens on red blood cells. In blood group O, neither A nor B antigen is expressed, and A or B alone does not show codominance. The likely mistake is choosing A because it is a named blood group, without checking whether both alleles are expressed together.
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