Mitosis

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  • Created by: Laura
  • Created on: 27-04-14 10:45
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  • Mitosis
    • Mitosis produces two daughter nuclei that have the same number of chromosomes as the parent cell and each other
    • Except in the rare event of mutation, the genetic make-up of the two daughter nuclei is also identical to that of the parent nucleus
    • Mitosis is always followed by a period where the cell is not dividing. This is called interphase
    • Although mitosis is a continuous process it can be divided into four stages
      • 1. Prophase, in which the chromosomes become visible and the nuclear envelope disappears
      • 2. Metaphase, in which the chromosomes arrange themselves at the centre of the cell
      • 3. Anaphase, in which each of the two threads of a chromosome migrates to an opposite pole
      • 4. Telophase, in which the nuclear envelope reforms
    • The importance of mitosis
      • Growth. when two haploid cells fuse to forma diploid cell it has the genetic information needed to form the new organism.
      • Differentiation. These cells change to give groups of specialised cells
      • Repair. If cells are damaged or die it is important that the new cells produced have an identical structure and function to the ones that have been lost

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