polymorphism (n.), polymorphic (adj.)

https://doi.org/10.1351/goldbook.11106
  1. 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.
  2. 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 [Terms] [Paper]