Cell division and reproduction can occur in two ways - mitosis and meiosis.Mitosis is a process of cell duplication, or reproduction, during which one cell gives rise to two genetically identical daughter cells.Meiosis, on the other hand, is a division of a germ cells involving two fissions of the nucleus and giving rise to four gametes, or sex cells, each possessing half the number of chromosones of the original cell.Mitosis is used by single celled organisms to reproduce; it is also used for the organic growth of tissues, fibers, and membranes. Meiosis is useful for sexual reproduction of organisms. The male and female sex cells, e.g. the spermatozoa and egg, fuse to create a new, singular biological organism.