Biology: Cell Division Cycle

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Change is constant throughout all living things and that is particularly true when it comes to biology and in particular cell-division cycle. All organisms are constantly dividing and growing throughout their life time. The cell-division cycle in eukaryotes is a complex process that involves cyclins, cdks and multiple checkpoints that eventually lead to cell division. There are two different types of cell division which are Meiosis and Mitosis. Meiosis is the type of cell division which involves gametes or sex cells that are involved in sexual reproduction. This type cell division produces 4 different haploid (N) cells from an original diploid (2N) cell. The four haploid cells produced are unidentical to the original diploid cell due to crossing over of chromosomes during cells division. In a way, the cell-division cycle is also involved in sexual reproduction when two gametes are fused together in order to create a living organism that is made up of complex cells and organs.
Mitosis is the other type of cell division which involves regular cells in the body. This type of cell division involves a normal haploid cell which is replicated and divided into two identical cells. The resulting cells are identical because there are no sex cells involved so crossing over of chromosomes does not take place. Mitosis is referred to as binary fission in prokaryotes where one cell divides into two identical cell types. When a cell first enters cell-division cycle, it needs to take in certain necessary nutrients which it acquires during interphase. This phase prepares the cell for more cell division in the future. A typical cell spends 90% of its time in the interphase before it moves on to mitosis.
During the cell-division cycle, a cell spend...

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...ng Biology (n.d.): n. pag. Web. 08 Apr. 2014. .
Braun-Dullaeus, Ruediger. "Cell Cycle Progression." Cell Cycle Progression. N.p., 2012. Web. 07 Apr. 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 Fates." N.p., 05 Dec. 2005. Web. 08 Apr. 2014..
Wolf, Gunter. "Molecular Mechanisms of Diabetic Mesangial Cell Hypertrophy: A Proliferation of Novel Factors." JASN. Journal of the American Society of Nephrology, 2002. Web. 08 Apr. 2014. .
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