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Single Nucleotide Polymorphism (SNP)

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Synonyms

SNP (pronounced “snip”)

Definition

The term “single nucleotide polymorphism” contains two defining criteria. First, it refers to a single nucleotide, i.e., an individual base pair, that can differ between individuals. Second, the word polymorphism indicates that a particular nucleotide change of interest is shared by at least 1% of the population.

SNPs occur when one base pair replaces another base pair in a point mutation (see DNA entry for discussion of bases). For example, an A-T pairing may be replaced by a G-C pairing. Such a mutation does not typically harm the organism.

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DNA

Polymorphism

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References and Readings

  • Britannica. (2009). The Britannica guide to genetics (Introduction by Steve Jones). Philadelphia: Running Press.

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Correspondence to J. Rick Turner .

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© 2013 Springer Science+Business Media, New York

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Turner, J.R. (2013). Single Nucleotide Polymorphism (SNP). In: Gellman, M.D., Turner, J.R. (eds) Encyclopedia of Behavioral Medicine. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1005-9_720

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  • DOI: https://doi.org/10.1007/978-1-4419-1005-9_720

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4419-1004-2

  • Online ISBN: 978-1-4419-1005-9

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