Complete dominance is when an individual carrying two alleles that are both dominant (AA), the trait that they represent will be expressed like in eye color. But if the individual carries two alleles in a manner that one is dominant and the other one is recessive, (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).
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