What is allele?

  • (noun): One of two alternate forms of a gene that can have the same locus on homologous chromosomes and are responsible for alternative traits.
    Synonyms: allelomorph


An allele ( /ˈæliːl/ or /əˈliːl/) is one of two or more forms of a gene or a genetic locus (generally a group of genes). The form "allel" is also used, an abbreviation of allelomorph. Sometimes, different alleles can result in different observable phenotypic traits, such as different pigmentation. However, many variations at the genetic level result in little or no observable variation.

Read more about Allele.

Some articles on allele:

Allele - Allelic Variation in Genetic Disorders
... are caused when an individual inherits two recessive alleles for a single-gene trait ... Other disorders are also due to recessive alleles, but because the gene locus is located on the X chromosome, so that males have only one copy (that is, they are hemizygous), they are more frequent in ... such as Huntington disease, occur when an individual inherits only one dominant allele ...
Balding–Nichols Model
... model is a statistical description of the allele frequencies in the components of a sub-divided population ... With background allele frequency p the allele frequencies, in sub-populations separated by Wright's FST F, are distributed according to independent draws ...
PRPF31 - Inheritance
... This is thought to be due to the presence of two wild type alleles, a high-expressivity allele and a low-expressivity allele ... If a patient has a mutant allele and a high-expressivity allele, they do not show disease phenotype ... If a patient has a mutant allele and a low-expressivity allele, the residual level of protein falls beneath the threahold for normal function, and so they do show disease ...
Particulate Inheritance - Mendel's Methods - Mendel's Laws - Law of Dominance
... plants, Mendel observed that the "T" allele (dominant) masked the effects of the "t" allele (recessive) ... The terms "dominant" and "recessive" are used for the masking and the covered allele, respectively ... They also are tall (because the allele for tall masks the allele for short) in terms of their "phenotype" ...
2% of the Chinese population carry the allele ... CYP2C9*13 allele frequencies in East Asian populations is summarized in Table S of this paper ... CYP2C9*13 allele was correlated with reduced plasma clearance of drugs that are substrates for CYP2C9 ...