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Related to allele: Dominant allele, multiple allele, Recessive allele


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 ?
Various types of studies have shown that the Asp40 allele on the OPRMl, the gene that encodes for the mu-opioid receptor, is functionally active and might predict response to treatment with naltrexone, Dr.
In particular, the Allele Frequency Community has the potential to create increasing value for life sciences and clinical research since information on observed allele frequencies can create important benchmarks that significantly increase the accuracy of findings from data generated by molecular analyses, such as Next-Generation Sequencing (NGS).
Spiked blood samples, as well as an aliquot of an unspiked blood sample (NL allele control), were spotted onto 3MM Whatman filter paper.
Oligonucleotides corresponding to the s allele bind the Sp1 protein with higher affinity than those corresponding to the S allele (10) and Ss heterozygotes have three times more transcripts from the s allele than from the S allele.
The long allele is more efficient, resulting in increased gene expression and thus more serotonin transporters in the cell membrane.
Allele frequencies were also compared with previously reported frequencies by others to address the racial and inter-ethnic differences.
259) hypothesized that associations might be modified by a common variant allele of the aminolevulinic acid dehydratase (ALAD) gene, which encodes the primary carrier protein for lead in blood.
Two alleles 100 and 105 were also found at EST, but the 105 allele was quite rare.
Due to the polymerase chain reaction amplification used in the test, one needs to be cautious even when equal signal intensities for each allele are observed.
The third form was the 7 allele fragments; we assumed that they each provided independent information.
The ADH1B*1 allele encodes the [beta]1 subunit that has arginine (Arg) at positions 48 and 370; (4) this is the reference allele.
Degussa AG (Dusseldorf, Germany) has patented Coryneform bacteria which have, in addition to at least one copy, present at the natural site (locus), of an open reading frame (ORF), gene or allele which codes for the synthesis of a protein or an RNA, in each case a second, optionally third or fourth copy of this open reading frame (ORF), gene or allele at in each case a second, optionally third or fourth site in a form integrated into the chromosome and processes for the preparation of chemical compounds by fermentation of these bacteria.