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What is an allele?

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An allele is one of two or more possible values for a phenotype. For example, in certain pea plants, such as those Mendel bred, they could have one of two phenotypes for colour; either green or yellow. Each type is referred to as an allele. One allele may be dominant while the other may be recessive. It's just a handy term to handle the concept of different possibilities for the same gene.

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