In the case of blood types, both alleles A and B may be expressed as the phenotype. This exemplifies: A) polygenic inheritance. B) sex ^-linked inheritance. C) codominance. D) incomplete dominance.

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In codominance, both alleles are expressed equally in the phenotype. In the case of blood types, both A and B alleles are expressed, resulting in the AB blood type.

In the Case of Blood Types, Both Alleles a and B