Cell division is a continuous process that occurs in all living organisms. It has been divided into two categories: mitosis and meiosis. Both forms of nuclear division occur in eukaryotes, and these processes comprise the cell cycle: G


S (synthesis of DNA)



M (mitosis or meiosis)

C (cytokinesis) (Smith and Kindfield, 1999). Mitosis occurs in somatic tissues, where each chromosome is divided identically into halves, both qualitatively and quantitatively. In contrast, meiosis takes place in germ cells, with the consequence that nuclei with haploid chromosome numbers are produced. Both types of cell division play important roles in the development and hereditary continuity of an organism.