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Related to allelism: Multiple Allelism


Any of the alternative forms of a gene or other homologous DNA sequence. Also called allelomorph.

[German Allel, short for Allelomorph, allelomorph, from English allelomorph.]

al·le′lic (ə-lē′lĭk, ə-lĕl′ĭk) adj.
al·le′lism n.


(əˈliːl) or


(Genetics) any of two or more variants of a gene that have the same relative position on homologous chromosomes and are responsible for alternative characteristics, such as smooth or wrinkled seeds in peas. Also called: allelomorph See also multiple alleles
[C20: from German Allel, shortened from allelomorph, from Greek allēl- one another + morphē form]
alˈlelic adj
alˈlelism n



one of two or more alternative forms of a gene occupying the same position on matching chromosomes: an individual normally has two alleles for each trait, one from either parent.
[1930–35; < German Allel, appar. as shortening of German equivalents of allelomorph or allelomorphic gene]
al•lel•ic (əˈli lɪk, əˈlɛl ɪk) adj.
al•lel′ism, n.


Any of the possible forms in which a gene for a specific trait can occur. In almost all animal cells, two alleles for each trait are inherited, one from each parent. Alleles on each of a pair of chromosomes are called homozygous if they are similar to each other and heterozygous if they are different.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.allele - (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same characterallele - (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character; "some alleles are dominant over others"
cistron, gene, factor - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors"
dominant allele, dominant - an allele that produces the same phenotype whether its paired allele is identical or different
recessive, recessive allele - an allele that produces its characteristic phenotype only when its paired allele is identical
genetic science, genetics - the branch of biology that studies heredity and variation in organisms


n. alelo, alelomorfo, uno de dos o más genes de una serie que ocupa la misma posición en cromosomas homólogos y que determina características alternantes en los descendientes.
References in periodicals archive ?
Null allelism was investigated by using the randomization test of Guo and Thompson (1992) and the 17-test statistic of Raymond and Rousset (1995), with the software program ML-NullFreq (available at website).
Molecular mapping of stripe rust resistance gene YrCH42 in Chinese wheat cultivar Chuanmai 42 and its allelism with Yr24 and Yr26.
Allelism testing is required to determine whether the dominant resistance gene in 'Azadi' cultivar is the same gene as one of those previously identified in other wheat accessions.
Yellow mutant albinism: Cytochemical, ultrastructural, and genetic characterization suggesting multiple allelism.
Although phenotypically different, allelism is attributed to the disability of uromodulin excretion in affected tubules leading to hyperuricemia.
We conducted allelism tests of these mutations in order to identify how many mutant loci are involved.
We saw no evidence of allelism (see Methods) and, therefore, assumed that the bands we scored were independent.
Allelism of blast resistance genes in near-isogenic lines of rice.
1:00 Welcome and Overview 1:10 "An allelism test for species cytoplasmic specific (scs) genes.
However, a cross of the two mutants produced wild type progeny, ruling out allelism and furnishing information that SS-18 and SS-462 were not linked.