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Schematic diagram showing alleles of genes in different specimens of Drosophila flies.

(genetic biology)

Grammar: noun
plural: alleles
Definition: one of two or more alternative genes for a particular character (e.g. eye colour). Alleles are genes that occur on the same place on homologous chromosomes (i.e. pairs of chromosomes).
Example:
In some cases both alleles for a trait or character are expressed.
Related Word: allelic (adjective)