2.6.2- Mitosis

• Interphase: the period of general cell growth and preparation for mitosis.
• Prophase:

  • DNA coils around a histone protein
  • Chromosomes and chromatins condense
  • Centrioles produce spindle fibres
  • Nuclear envelope breaks down

  
• Metaphase:

  • Chromatids lineup at the centre
  • Fibres attach to the centromere

  
• Anaphase:

  • Chromatids are pulled to the side by the fibres and motor proteins

  
• Telophase:

  • New nuclear envelopes are formed around the two new nuclei
  • Chromatids uncoil

  
• Cytokinesis:

  • Division of cytoplasm
  • Creates to genetically identical daughter cells

  
• Cytokinesis in animal cells results in the cell surface membrane being pulled in by cytoskeleton. This forms a cleavage furrow which breaks to form 2 daughter cells.
• Cytokinesis in plant cells creates 2 new cells by getting vesicles containing cellulose, to line up at the metaphase plate, and fuse with each other & the cell surface membrane. (Cell wall prevents formation of cleavage furrow)
• Mitosis has 6 stages

  • Interphase
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
  • Cytokinesis