Biology: Cell Division Cycle Essay

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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…show more content…
The cell-division cycle is completed when a cell passes all the checkpoints, has stopped dividing and is in the resting or G0 phase. The G1 phase is known as the growth phase of the cell cycle. During this phase, the biosynthetic activities that are slowed down during the M phase of the previous cell division are resumed at a much higher rate. The G1 phase known as the growth phase of the cell because the supply of cell organelles and proteins increases. This phase contains a checkpoint to ensure that all materials are in place for DNA replication to go smoothly in the S phase of Interphase. As far as time is concerned, in normal human cells, the whole process of the cell cycle takes about 18 hours to complete and the G1 phase takes at least a third of that time meaning six hours which is a fourth of a normal day’s time. However, the G1 phase and other sub phases of the cell cycle can be inhibited by limiting growth factors such as the temperature they are grown in, their nutrient supply and how much space and they have to grow because after a certain amount of time, the cells stop proliferation and enter the death phase when they run out of these supplements. The G1 phase also involves the use of all 20 amino acids to form the various number of enzymes, mRNA and proteins that are required for DNA synthesis. The G1 phase is the most important phase of the cell-division cycle because this is the phase where it is determined is the cell is committed to
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