The ABO blood type gene is an example of ___________, which means that heterozygotes display two phenotypes at the same time.

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Codominance is the inheritance pattern where both alleles in a heterozygote are expressed equally and simultaneously, resulting in an intermediate phenotype. This is the case with the ABO blood type gene, where the A and B alleles are codominant over the O allele, and heterozygotes display both A and B antigen expression on their red blood cells.

The ABO Blood Type Gene Is an Example of ___________