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This is generally the definition of an allele. An allele is an "alternate form of a gene". For each gene there may be many alleles. For example (simplistically) the gene which makes the pigment in your eyes (ie which gives you your eye colour) has a brown, green and blue allele. On each of the two chromosomes (one from your mother and one from your father) you can have either the same allele (homozygous) or a different allele (heterozygous). In the case of a heterozygous gene the dominate allele is expressed. In some cases (co-dominance) both alleles are expressed.

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