A polymorphism is variation in the genome that is common to a number of people within a population. A polymorphism can be as small as a single base pair, called a single nucleotide polymorphism or SNP.
Usually a polymorphism is not harmful, but in some cases it can be involved in a disease, or predispose someone to a certain disease. With genetic mapping on a large scale it is possible to uncover the genes involved in polymorphisms.
- ↑ Alberts, Bray, Hopkin, Johnson, Lewis, Raff, Roberts, Walter (2009), Essential Cell BIology, 3rd Edition, New York, Garland Science, Page 679