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1. Ploidy
The number of sets of chromosome s within a cell or organism. Each set is designated "n" so one set is n is haploid , two sets is 2n is diploid , three sets is 3n is triploid , four sets is 4n is tetraploid, etc. Also, unspecified multiple sets (but more than two) is polyploidy , and extremely large number of sets may be designated by number (for example 15-ploid for fifteen sets).

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