Allele — One of the two copies of each gene containing specific inheritable characteristics.


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Allele—A form of a gene. Each person receives two alleles of a gene, one from each biological parent. This combination is one factor among many that influence a variety of processes in the body. On chromosome 19, the apolipoprotein E (APOE) gene has three common alleles: ?2, ?3, and ?4.

Source: NIA (NIH)2

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Alleles: Variant forms of the same gene, occupying the same locus on homologous Chromosomes, and governing the variants in production of the same gene product.3


Types may include:4

Types of Allele:

  • Low Penetrance Allele

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  1. Source: RDCRN (NCATS/NIH): cms/ bbd/ Learn-More/ Glossary
  2. Source: NIA (NIH): health/ alzheimers-disease-genetics-fact-sheet
  3. Source: MeSH (U.S. National Library of Medicine)
  4. Source: NCI Thesaurus

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