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Reverted edits by AndrewWi (Talk) to last revision by Philip J. Rayment
An '''allele''' is a variant form of a [[gene]]. Since many organisms have two [[chromosomes|chromosome]], they each have two alleles. Individuals that are homozygous possess two of the same allele, individuals that are heterozygous contain two different alleles. In the case that an individual is heterozygous, the allele that is expressed is known as the dominant allele.
An '''allele''' is a variant form of a [[gene]]. Since many organisms have two [[chromosomes|chromosome]], they each have two alleles. Individuals that are homozygous possess two of the same allele, individuals that are heterozygous contain two different alleles.
==Classification of alleles==
==Classification of alleles==