Medical Dictionary

single nucleotide polymorphism


Medical Definition of single nucleotide polymorphism

  1. :  snp Although all humans share 99.9 percent of their genetic material, single-letter differences in our DNA sequences—known as single nucleotide polymorphisms, or SNPs (“snips”)—ensure that each individual is unique.—Alison McCook, Scientific American, July 2001 In DNA dialect, if the nucleotide letter T appears instead of C, or G where usually there's A, the gene is said to contain a single nucleotide polymorphism.—Jeff Wheelwright, Discover, April 2002

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