- 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.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 794 (https://doi.org/10.1515/pac-2015-1202)