In complete dominance, a dominant gene will be expressed if the person is either homozygous or heterozygous for that trait.

Complete Dominance

a genetic condition where one allele completely masks the effect of another allele in a heterozygous combination.

Dominant Gene

A gene that expresses its phenotype in the presence of another allele.

Homozygous

A genetic condition where an individual has two identical alleles for a particular trait or gene.