Final answer:
Codominance is exemplified in the ABO blood type system where A and B alleles are expressed equally, leading to blood type AB.
Explanation:
Codominance is characterized by the equal, distinct, and simultaneous expression of both parents' different alleles. An example of codominance in humans is the ABO blood type system, where individuals with both A and B alleles express both antigens equally, resulting in blood type AB. This demonstrates how A and B alleles behave in a codominant manner with respect to one another.
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