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  • the presence of several distinct forms of a gene or phenotypic trait within a population with frequencies greater than 1 percent.
    Source: Anthromorphemics
  • more than two types of castes of individuals in a colony or community that belong in the same species and are derived from the same parents. The various castes of honeybees, ants, termites, and so forth are typical
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • the existence of a genetically determined trait in two or more forms in a population
    Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
  • Polymorphism involves one of two or more variants of a particular DNA sequence. The most common type of polymorphism involves variation at a single base pair. Polymorphisms can also be much larger in size and involve long stretches of DNA. Called a single nucleotide polymorphism, or SNP (pronounced snip), scientists are studying how SNPs in the human genome correlate with disease, drug response, and other phenotypes.

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