https://doi.org/10.1351/goldbook.11106
- Occurrence of a gene in more than one distinct nucleotide sequence in a population, resulting from mutation(s) and potentially producing gene products with different levels of function.
Note: It is sometimes considered that the least frequent of polymorphic gene sequences should be present in at least \(\pu{1\%}\) of the population; otherwise the variant is a mutation rather than a polymorphism. - Occurrence of different phenotypes of a single trait.