are genes that will show themselves. are genes that are less likely to show themselves. is one of all of the possible options for a given gene.

An allele is one possible version of a gene. Some alleles are dominant and tend to show their effect when present; recessive alleles are less likely to show their effect when a dominant allele is also present. So the definition “one of all the possible options for a given gene” matches “An allele.”

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