any of several forms of a gene, usually arising through mutation, that are responsible for hereditary variation.
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 (əˈliːləˌmɔːf) See also multiple alleles

1931, from German allel, abbreviation of allelomorph (1902), coined from Greek allel- “one another” (from allos “other;” see alias) + morphe “form” (see Morpheus).

allele al·lele (ə-lēl’)
One member of a pair or series of genes that occupies a specific position on a specific chromosome. Also called allelomorph.
al·le’lic (ə-lē’lĭk, ə-lěl’ĭk) adj.
Any of the possible forms in which a gene for a specific trait can occur. In almost all animal cells, two alleles for each gene are inherited, one from each parent. Paired alleles (one on each of two paired chromosomes) that are the same are called homozygous, and those that are different are called heterozygous. In heterozygous pairings, one allele is usually dominant, and the other recessive. Complex traits such as height and longevity are usually caused by the interactions of numerous pairs of alleles, while simple traits such as eye color may be caused by just one pair.
allele [(ul-leel)]

The sequence of nucleotides on a DNA molecule that constitutes the form of a gene at a specific spot or a chromosome. There can be several variations of this sequence, and each of these is called an allele. In the case of the gene for eye color, for example, one allele codes for blue eyes, whereas the other may code for brown eyes.


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  • Allelomorph

    . Historical Examples When this mutant first appeared its similarity to arc led us to suspect that it might be arc itself or an allelomorph of arc. Sex-linked Inheritance in Drosophila Thomas Hunt Morgan In the fifth figure (e) the color of the darkest fly is due to a factor called ebony, which is an […]

  • Allelopathy

    suppression of growth of a plant by a toxin released from a nearby plant of the same or another species. noun the inhibitory effect of one living plant upon another by the release of toxic substances allelopathy (ə-lē-lŏp’ə-thē, āl’ə-) The inhibition of growth in one plant species by chemicals produced by another. For example, other […]

  • Allelotaxis

    allelotaxis allelotaxis al·le·lo·tax·is (ə-lē’lə-tāk’sĭs, ə-lěl’ə-) or al·le·lo·tax·y (ə-lē’lə-tāk’sē, ə-lěl’ə-) n. Development of an organ or part from several different embryonic structures or tissues.

  • Alleluia

    praise ye the Lord; hallelujah. a song of praise to God. interjection praise the Lord! Used more commonly in liturgical contexts in place of hallelujah noun a song of praise to God late 14c., from Latin alleluja, from Greek allelouia, from Hebrew hallelu-yah “praise Jehovah” (see hallelujah). the Greek form (Rev. 19:1, 3, 4, 6) […]

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