Complete dominance



A kind of dominance wherein the dominant allele completely masks the effect of the recessive allele in heterozygous condition.


For instance, an individual carrying two alleles that are both dominant (e.g. AA), the trait that they represent will be expressed. But if the individual carries two alleles in a manner that one is dominant and the other one is recessive, (e.g. Aa), the dominant allele will be expressed while the recessive allele will be suppressed. Hence, the heterozygote (Aa) will have the same phenotype as that of the dominant homozygote (AA). This condition is called complete dominance.

Compare: incomplete dominance, codominance.
See also: allele, dominance.

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