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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 ?
Characterisation of a vWA null allele in the South African population.
The CSN1S2 F allele is characterized by a G13C transition occurring at exon 3, which results in an amino acid substitution Val7[right arrow]Ile (Bouniol et al.
When the allele type frequencies were compared between RA-patient group and the control group, the DRB1*10 allele was found to be significantly higher in the RA patient group, while the DRB1*07 and DRB1*11 alleles were significantly lower in patients with RA (p<0.
The development of single-locus allele specific markers for waxy null alleles is a desirable goal to find wheat carrying waxy alleles.
The R3 allele that we linked in the current study to lower levels of maternal gentle guidance (i.
Many biology students struggle to understand key terms such as gene and allele even after classroom and laboratory instruction (Yilmaz et al.
Taylor MD and Shimon Saphire-Bernstein, both from the University of California, Los Angeles (UCLA) and colleagues found that people who had one or two copies of the OXTR gene with an "A" (adenine) allele at a particular location tended to have more negative measurements compared to participants who had two copies of the "G" (guanine) allele.
The long allele is more efficient, resulting in increased gene expression and thus more serotonin transporters in the cell membrane.
The sustained virologic response (SVR) rate doubled and even tripled in patients with the CT or TT allele, and those with the CC allele also experienced an increase in SVR when telaprevir (Incivek) was included in the regimen, lead investigator Dr.
This study was designed to investigate the prevalence of mutant T allele frequency in healthy individuals.
The maximum likelihood estimate of allele frequencies at the ABO locus was obtained through Bernstein method and the concordance with Hardy-Weinberg equilibrium (HWE) was tested by Chi-test (Strickberger, 2005; Falconer and Mackay, 1996).