ploidy

"Haplo" redirects here. For the fictional character, see The Death Gate Cycle. Ploidy is the number of homologous sets of chromosomes in a biological cell. The ploidy of cells can vary within an organism. In humans, most cells are diploid (containing one set of chromosomes from each parent), but sex cells (sperm and egg) are haploid. In contrast, tetraploidy (four sets of chromosomes) is a type of polyploidy and is common in plants, and not uncommon in amphibians, reptiles, and various species of insects.
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[PLOY-dee]
The number of sets of chromosomes in a cell or an organism. For example, haploid means one set and diploid means two sets.