Dominant and Recessive Alleles
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A dominant allele's trait appears in a heterozygote and masks the recessive allele's trait, which appears only in a homozygous recessive genotype.
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The yellow-seed allele Y is dominant over the green-seed allele y, so a Yy plant shows yellow seeds.
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Dominance describes which trait shows in a heterozygote — it says nothing about which allele is more common in a population.