Ma'anar ƙamus na kalmar "allelomorph" (wanda kuma aka sani da "allele") wani nau'i ne na jinsin halitta wanda ke faruwa a takamaiman wuri akan chromosome. Alleles suna da alhakin nau'o'in halayen gado daban-daban, kamar launin ido ko nau'in jini, kuma suna iya zama rinjaye, masu rinjaye, ko masu rinjaye. Nazarin alleles da gadonsu muhimmin bangare ne na kwayoyin halitta.
