Dictionary of Human Evolution and Biology

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Dominant Pattern Of Inheritance

In Mendelian genetics, a system of inheritance in which, when one allele of any ancestral homozygote mutates to form a new heterozygote, the resulting phenotype of that heterozygote is distinguishable from the homozygote. In this case the ancestral homozygote is termed the recessive homozygote (aa), the new heterozygote is termed Aa, and the new dominant mutant allele is termed A. In many cases the subsequent possible homozygote (AA) is unviable. An example in humans is achondroplasia.

See recessive pattern of inheritance, codominant pattern of inheritance, and incomplete dominance.

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