Dictionary of Human Evolution and Biology

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Polyploid

Individual containing more than two, usually complete, sets of genes and chromosomes. If the common ancestor of a polyploid species was diploid (2N), subsequently derived species may be tetraploid (4N), and so forth. Polyploidy is a mode of chromosome evolution, not uncommon in plants and rare but significant in animals.

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From "Dictionary of Nursing and Individual Health Care"