- polymorphism, single nucleotide
- A single nucleotide variation in a genetic sequence that occurs at appreciable frequency in the population.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- A variant DNA sequence in which the purine or pyrimidine base (as cytosine) of a single nucleotide has been replaced by another such base (as thymine).
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
- Single nucleotide polymorphisms (SNPs) are a type of polymorphism involving variation of a single base pair. Scientists are studying how single nucleotide polymorphisms, or SNPs (pronounced "snips"), in the human genome correlate with disease, drug response, and other phenotypes.
Definition from: Talking Glossary of Genetic Terms from the National Human Genome Research Institute
Related discussion in the Handbook
See also Understanding Medical Terminology.