Change is constant in all living things and this is especially true when it comes to biology and in particular the cell division cycle. All organisms divide and grow constantly throughout their lives. The cell division cycle in eukaryotes is a complex process that involves cyclins, cdks, and multiple checkpoints that ultimately lead to cell division. There are two different types of cell division: meiosis and mitosis. Meiosis is the type of cell division that involves the gametes or sex cells involved in sexual reproduction. This type of cell division produces 4 different haploid (N) cells from one original diploid (2N) cell. The four haploid cells produced are not identical to the original diploid cell due to the crossing of chromosomes during cell division. In a way, the cell division cycle is also involved in sexual reproduction when two gametes are fused together to create a living organism composed of complex cells and organs. Mitosis is the other type of cell division that involves regular cells. in the body. This type of cell division involves a normal haploid cell that is replicated and divided into two identical cells. The resulting cells are identical because no sex cells are involved, so crossing over of chromosomes does not take place. Mitosis is called binary fission in prokaryotes, where a cell divides into two identical cell types. When a cell first enters the cell division cycle, it needs to absorb certain necessary nutrients that it acquires during interphase. This phase prepares the cell for more cell divisions in the future. A typical cell spends 90% of its time in interphase before moving into mitosis. During the cycle of cell division, a cell passes...... middle of article ......ng Biology (nd): n. page. Internet. April 8, 2014. .Braun-Dullaeus, Ruediger. “Cell Cycle Progression.” Cell cycle progression. NP, 2012. Web. April 7, 2014.Cooper GM. The cell: a molecular approach. 2nd edition. Sunderland (MA): Sinauer Associates; 2000. Regulators of cell cycle progression. .Passegué, Emmanuelle. “Global analysis of proliferation and cell cycle gene expression in the regulation of hematopoietic stem and progenitor cell fate.” Np, December 5, 2005. Web. April 8, 2014..Wolf, Gunter. “Molecular mechanisms of diabetic mesangial cell hypertrophy: a proliferation of new factors.” JASN. Journal of the American Society of Nephrology, 2002. Web. April 8. 2014. .