Two nuclei from one - Mitosis

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  • Created by: Steff06
  • Created on: 06-04-16 13:08
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  • Mitosis
    • Organisms need to produce genetically identical daughter cells for GROWTH, REPAIR and REPLACEMENT.
    • Mitosis refers to the process of NUCLEAR DIVISION where 2 genetically identical nuclei are formed from one parent cell nucleus.
    • 4 stages in mitosis:
      • PROPHASE - Replicated chromosomes SUPERCOIL (shorten and thicken).
      • METAPHASE - Replicated chromosomes line up down the MIDDLE of the cell.
      • ANAPHASE - Replicas of each chromosome are pulled APART from each other towards OPPOSITE poles of the cell.
      • TELOPHASE - 2 new nuclei are FORMED.
    • PROPHASE = Chromosomes shorten and thicken and consist of a pair of sister chromatids. The nuclear envelope breaks down and disappears. The centriole divides into 2 and each moves to opposite poles to form the spindle.
    • METAPHASE = Chromosomes move to the central region of the spindle and each becomes attached to a spindle by its centromere.
    • ANAPHASE = Replicated sister chromatids are separated from each other when the centromere splits. The spindle fibres shorten, pulling the sister chromatids further away from each other towards the poles.
    • TELOPHASE = As the sister chromatids reach the poles of the cell, a new nuclear envelope forms around each set. The spindle breaks down and disappears. The chromosomes uncoil and can no longer be seen under a light microscope.
    • CYTOKINESIS = The whole cell splits to form 2 new cells, each containing a  full set of chromosomes identical to the original parent cell.
    • In PLANTS, only MERISTEM cells can divide this way.


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