Polysomy
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(päl·ē′sō·mē)
(genetics) The occurrence in a nucleus of an extra copy of one or more individual chromosomes.
American Heritage Stedman's Medical Dictionary:
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pol·y·so·my
(pŏl'ē-sō'mē)
n.
n.
The state of a cell nucleus in which a specific chromosome is represented more than twice.
Word Tutor:
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polysomy
IN BRIEF: n. - Congenital defect of having one or more extra chromosomes in certain cells.
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Saunders Veterinary Dictionary:
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polysomy
An excess of the numbers of a particular chromosome present.
Wikipedia on Answers.com:
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Polysomy
Polysomy is a condition in which an otherwise diploid organism has at least one more chromosome than normal, i.e. the number of a particular chromosome is not diploid[1] - there may be three or more copies of the chromosome rather than the expected two copies. Polysomy is usually caused by non-disjunction (the failure of a pair of homologous chromosomes to separate) during meiosis, but may also be due to a translocation mutation. Down syndrome in humans is an example of polysomy where affected individuals possess three copies (trisomy) of chromosome 21.
References
- ^ Rieger, R.; Michaelis, A.; Green, M.M. (1968). A glossary of genetics and cytogenetics: Classical and molecular. New York: Springer-Verlag.
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