Change is constant in all living things and this is especially true when it comes to biology and specifically the cell division cycle. All organisms divide and grow constantly throughout their lives. The cell division cycle in eukaryotes is a complex process involving cyclins, CDKs, and multiple checkpoints that ultimately lead to cell division. There are two different types of cell division which are meiosis and mitosis. Meiosis is the type of cell division involving 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 crossing over of chromosomes during cell division. In a sense, the cell division cycle is also involved in sexual reproduction when two gametes are fused together to create a living organism made up 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 being 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 occur. Mitosis is called binary fission in prokaryotes in which a cell divides into two identical cell types. When a cell first enters the cell division cycle, it must take in some necessary nutrients that it acquires during interphase. This phase prepares the cell for further cell divisions in the future. A typical cell spends 90% of its time in interphase before moving into mitosis. During the cell division cycle, a cell spends...... middle of paper ......ng Biology (n.d.): Page No. Network. 08 April 2014. .Braun-Dullaeus, Ruediger. "Cell cycle progression". Cell cycle progression. Np, 2012. Web. 07 April 2014. Cooper GM. The cell: a molecular approach. 2nd edition. Sunderland (MA): Sinauer Associates; 2000. Regulators of cell cycle progression. .Success, Emmanuelle. “Global analysis of cell cycle proliferation and gene expression in the regulation of hematopoietic stem and progenitor cell fate.” Np, 05 December 2005. Web. 08 April 2014..Lupo, Gunter. “Molecular mechanisms of diabetic mesangial cell hypertrophy: a proliferation of new factors.” JASN. Journal of the American Society of Nephrology, 2002. Web. 08 April. 2014. .