Tuesday 25 February 2014

Mitosis and the cell cycle. DNA is replicated and this takes place during interphase.

After a cell is created it goes through a several stages:

  1. G1: the first phase of growing, when proteins and organelles are being made
  2. S: synthesis, when DNA is being replicated
  3. G2: the second phase of growth when organelles and energy supplies are increased
  4. Prophase: chromosomes become visible, nuclear envelope and nucleolus disintegrate
  5. Metaphase: chromosomes line up in the middle of the cell; spindle fibres form
  6. Anaphase: Spindle fibres contract pulling chromosomes to the poles
  7. Telophase: nuclear envelopes and nucleoli form around both sets of DNA
  8. Cytokinesis: the cells cytoplasm divides into two
1, 2, and 3 are all part of the 'interphase' when the cell is not in the process of replicating.
4, 5, 6 and 7 are all part of mitosis, which is explained in greater detail in the following post:


This diagram represents the cell cycle:
(ignore the check point markings)

ricochetscience.com

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