History of Science
A dominant allele is a variant of a gene that expresses its trait in the phenotype even when only one copy is present in the organism. This means that if an individual has at least one dominant allele, that trait will be visible, overshadowing any recessive alleles they may also possess. Understanding dominant alleles is crucial for grasping the basic principles of heredity outlined by Mendel, which laid the groundwork for modern genetics.
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