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•  The various specific forms of a gene are alleles

•  Alleles differ from each other by one or only a few bases

Alleles are alternative forms of a gene that code for the different variations of a specific trait

  • For example, the gene for eye colour has alleles that encode different shades / pigments

As alleles are alternative forms of the one gene, they possess very similar gene sequences

  • Alleles only differ from each other by one or a few bases

Genes and Potential Allelic Variations