Final answer:
Dominant alleles express specific traits in individuals, leading to dominant phenotypes. Recessive phenotypes are only visible when two recessive alleles are present.
Explanation:
Dominant alleles result in the expression of a particular trait in an individual, even when one dominant allele is present in the genotype. This leads to the dominant phenotype being displayed. In contrast, the recessive phenotype is only evident when two recessive alleles are present, known as homozygous recessive.
For example, in a heterozygote individual with one dominant and one recessive allele, the dominant allele will mask the presence of the recessive allele, showcasing the dominant trait.
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