1 overview

• Before meiosis 1

  interphase - cell copies X + organelles
• prophase 1

  • X condense + visible
  • Homologous X link together
  • this forms chiatasma
  • =Bivalent
  • Crossing Over: exchanging alleles between Homologous X
  • Nuclear membrane breaks down
  • Centrioles move to opposite poles of cell
  • spindle fibres assemble into spindle apparatus
• metaphase 1

  X lined at equator of spindle apparatus + independent assortment
• Anaphase 1

  • spindle fibres shorten
  • homologous X move to opposite poles
  • for that to happen, chiatasma between homologous X break
• Telophase 1

  • X finally reached poles of cell
  • Nuclear membrane reforms
  • X uncoil back to their chromatin state
• cytokinesis

  cell splits into 2 haploid daughter cells