Mitosis

• Interphase:

  • Chromosomes are extended, not visible
  • Chromosomes replicate ( Each is made of 2 identical sister chromatids joined at the centromere)
  • Centrioles replicate
  • Nuclear envelope is still there
  • Nucleolus is visible
• Prophase:

  • Chromosomes condense & become visible
  • Nucleolus breaks down
  • Nuclear membrane breaks down
  • Centrioles move to opposite poles of the cell & start forming spindle fibres
• Metaphase:

  • Nuclear membrane has broken down
  • Chromosomes align in the equator of the cell
  • Each chromosome is attaches to a spindle fibre by its centromere
• Anaphase:

  • Centromere of each chromosome splits
  • One chromatid from each chromosome moves to centrioles at the poles of the cell
  • The chromatids which are now separate are called chromosomes
• Telophase:

  • Nuclear membrane reforms around each group of newly divided chromosomes
  • Nucleolus reforms
  • Spindles breaks down
  • Chromosomes extend, becoming not visible
• Cytokinesis:

  • Cytoplasm divides
  • Produces 2 identical daughter cells