Cell Division

  1. What does mitosis produce?
    2 diploid daughter cells
  2. Define diploid.
    A cell containing two sets of chromosomes.
  3. What is interphase?
    • Period before mitosis during which the cell is not dividing.
    • DNA is replicated
  4. What are the 4 stages of mitosis?
    • Prophase
    • Metaphase
    • Anaphase
    • Telophase
  5. What occurs in prophase?
    • Chromosomes become visible
    • Centrioles move to poles
    • Spindle fibres form
    • Nucleolus disappears¬†
    • Nuclear envelope breaks down
    • Chromosomes drawn to equator
  6. What occurs in metaphase?
    Chromosomes arrange themselves across equator of cell
  7. What occurs in anaphase?
    • Centromeres divide into two¬†
    • Spindle fibres pull chromatids apart
    • Chromatids move to poles, now chromosomes
    • Energy provided by mitochondria
  8. What occurs in telophase?
    • Chromosomes disappear
    • Spindle fibres disintegrate
    • Nucleolus re-forms
    • Nuclear envelope re-forms
    • Cytoplasm divides by cytokinesis
  9. What is the importance of mitosis?
    • Growth - ensures new organism resembles parents by being genetically identical
    • Repair - damaged cells
    • Reproduction - asexual reproduction gives two new organisms
  10. How does cell division take place in prokaryotic cells?
    • Binary fission
    • Circular DNA replicates and both copies attach to cell membrane
    • Plasmids also replicate
    • Cell membrane grows between the 2 DNA and pinches inwards, dividing cytoplasm into 2
    • New cell wall forms, dividing original cell into 2 identical daughter cells
  11. How do viruses replicate?
    • Non-living so cannot undergo cell division
    • Attach to host with attachment proteins
    • Inject nucleic acid into host cell
Card Set
Cell Division
Types of cell division, differences and importance.