English: Codominance and incomplete dominance are unique examples of how genes can be expressed in a heterozygous state (CBCY). Column 1 depicts a dominant gene being expressed in the phenotype, with the dominant allele masking the recessive allele. Column 2 depicts co-dominance, which is when both alleles are visible in the phenotype and neither allele masks the other. Column 3 depicts incomplete dominance, where the dominant allele (CB) is blended with the recessive allele.