BIOL 200 Chapter Notes - Chapter 7: Dna Replication, Restriction Point, S Phase

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10 Dec 2017
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The cell cycle is the sum and total of events that enable cells to proceed from one cell division to the next. G1 (gap 1) phase: "gap" between the end of cytokinesis and the start of dna synthesis. S (synthesis) phase: initiation and termination of dna synthesis. G2 (gap 2) phase: lasts from the end of dna synthesis to the onset of mitosis. M (for mitosis) phase: time interval during which division occurs. Note: collectively we consider g1, s and g2 to be interphase. There must be provision for cells to get out of the cell cycle and into other developmental pathways (mating, meiosis, differentiation) or to arrest. Discrete events, such as dna synthesis and mitosis, do not occur before the cell is ready, and that they occur in the right order. Only cell that should divide are allowed to do so (i. e. some cells must undergo terminal differentiation, senesce temporarily or permanently, or even go through programmed cell death)

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