Cell division

• What are the phases of interphase and their functions?

  • G1 (Gap 1): Cell elongation and production of organelles and proteins
  • S (Synthesis): DNA replication
  • G2 (Gap 2): Continued cell elongation, production of proteins for division, and error checking
• What are the main differences between mitosis and meiosis?

  • Mitosis: Produces 2 identical diploid cells
  • Meiosis: Produces 4 non-identical haploid cells
  • Mitosis: Involves one division
  • Meiosis: Involves two divisions
• What is the overall purpose of cell division?

  • Growth and development
  • Tissue repair and regeneration
  • Asexual reproduction
  • how cancer forms
  • replacement of lost cells
  • formation of clones of white blood cells
• Mitosis


  Produces 2 genetically identical diploid daughter cells
• Meiosis


  Produces 4 genetically identical haploid cells (gametes)
• Cancer


  Uncontrolled cell division of mutations in the gene that control the cell cycle
• Cancer treatment

  • chemotherapy
  • Blocking parts of the cell cycle (DNA replication-spindle fibres)
• Cell cycle


  A process cells go through where they can divide multiple times
• Specialised cells go through the cell cycle once so they need to be replaced by stem cells (G0)
• Majority of the cell cycle is in interphase
• When the cell is growing the DNA is replicated
• DNA is uncondensed and replicated so the amount of DNA is doubled
• Organelles are also doubled
• ATP is increased as more energy is needed