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What is the genetic condition in which the heterozygous individual has a different phenotype from the...

What is the genetic condition in which the heterozygous individual has a different phenotype from the homozygous individual?

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This condition is called lack of dominance and it can happen in two ways: incomplete dominance or codominance.

In incomplete dominance, the heterozygous individual presents an intermediate phenotype between the two types of homozygous ones, such as in sickle cell anemia, in which the heterozygous individual produces some sick red blood cells and some normal red blood cells.

Codominance occurs, for example, in the genetic determination of the MN blood group system, in which the heterozygous individual has a phenotype totally different from the homozygous one, and not an intermediate form.

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