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Noun
1. polyploidy
Wikipedia definition
2. PloidyPloidy is the number of sets of chromosomes in a biological cell. Human sex cells have one complete set of chromosomes from the male or female parent. Sex cells, also called gametes, combine to produce somatic cells. Somatic cells, therefore, have twice as many chromosomes. The haploid number (n) is the number of chromosomes in a gamete. A somatic cell has twice that many chromosomes (2n). Humans are diploid.
Read “Ploidy” on English Wikipedia
Read “倍数性” on Japanese Wikipedia
Read “Ploidy” on DBpedia

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