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ploidy |
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ploidyNumber of sets of chromosomes in the nucleus of a cell. In normal human body cells, chromosomes exist in pairs, a condition called diploidy. During meiosis the cell produces sex cells (gametes), each containing half the normal number of chromosomes, a condition called haploidy. When an egg and a sperm unite in fertilization, the diploid condition is restored. Polyploid cells have three or more times the number of chromosomes found in haploid cells; polyploid organisms usually cannot reproduce. Aneuploid cells have an abnormal number of chromosomes that is not a multiple of the haploid number. Aneuploidy is most often caused by an error leading to an unequal distribution of chromosomes during division. ploidy [′plȯid·ē] (genetics) Number of complete chromosome sets in a nucleus: haploid (N), diploid (2N), triploid (3N), tetraploid (4N), and so on. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A clinicopathologic study of 79 cases with an analysis of histologic subtypes, immunohistology, and DNA ploidy. Ploidy of serotype AD strains of Cryptococcus neoformans. Pathophysiology of Ovarian Cancer Characterization of Ovarian Epithelial Tumors Spread of Ovarian Cancer Staging Prognostic Factors Tumor Stage Peritoneal Fluid Cytology Tumor Histology Performance Status Age Volume of Residual Disease CA-125 Levels DNA Ploidy |
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