There are two main forms of non-Mendelian dominance. In ______, as observed in familial hypercholesterolemia, the dominant allele does not completely mask the recessive allele. In ______, as observed in AB blood type, two dominant alleles are expressed for the same phenotype.

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Incomplete dominance is when the dominant allele does not completely mask the recessive allele, resulting in a phenotype that is a blend of the two. Codominance occurs when both alleles in a heterozygote are fully expressed, such as in the AB blood type, where both A and B alleles are expressed equally.

There Are Two Main Forms of Non-Mendelian Dominance