single nucleotide polymorphism. A genetic change that is caused by substitution of a single nucleotide.
Defined regions of the genome where there are two or more nucleotide variations, each with 1% or greater prevalence in the population. SNPs can be used as genetic or physical markers.
DNA sequence variants (inherited single base changes) which occur frequently throughout the human genome (1 in every 3-500 bp) and are used as markers in whole genome linkage analysis.