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Meiosis is a special type of nuclear division which segregates one copy of each homologous chromosome into each new gamete. Mitosis maintains the cell's original ploidy level (for example, one diploid 2n cell producing two diploid 2n cells; one haploid n cell producing two haploid n cells; etc.).
Mitosis is the process in which a cell's nucleus replicates and divides. Mitosis results in two cells that are genetically identical. These cells are necessary for growth and replacement of worn out cells, as well as for asexual reproduction (reproduction without eggs and sperm) that takes place in some organisms.