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- The occurrence of a chromosomal segment more than twice in a diploid cell or organism.
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
- Duplication is a type of mutation that involves the production of one or more copies of a gene or region of a chromosome. Gene and chromosome duplications occur in all organisms, though they are especially prominent among plants. Gene duplication is an important mechanism by which evolution occurs.