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Cell Division
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Transcript

  • 1. Cell Division
    • Mitosis & Meiosis
  • 2. Why cells divide?
    • Replace old, damaged or dead cells
    • Growth of organism (multicellular)
    • Reproduce new organisms
  • 3. Prokaryotic Cell Division
    • Binary Fission:
    Cell Grows Chromosome copies Cell Splits Into Two
  • 4. Eukaryotic Cell Division
    • 2 kinds of cell division
      • Mitosis- Process in which 2 new cells with identical genetic material are made from the parent cell (1 diploid cell divides to produce 2 new diploid cells)
      • Meiosis- Process in which gametes (sex cells) are made in which they recieve half of the genetic information
  • 5. Cell Cycle
    • Repeating events of life of a cell
    • Three events:
      • Interphase: cell growing (not dividing)
      • Mitosis or Meiosis: Genetic material dividing
      • Cytokinesis: Division of cell itself
  • 6. Cell Cycle
  • 7. Interphase
    • G1 phase
      • cell grows to mature size
    • S phase
      • Cell’s DNA copies
    • G2 phase
      • Cell prepares for cell division
    • G0 phase- cell no longer divides (nerve cells)
  • 8. Interphase
  • 9. Mitosis Division of chromosomes
    • 4 Events
      • P rophase
      • M etaphase
      • A naphase
      • T elophase
  • 10. Prophase
    • Chromatin (DNA) shortens and tightens into distinct rod-shaped chromosomes
    • Nucleus & nucleolus disappear
    • Two pairs of centrioles migrate to each pole of the cell and release spindle fibers that radiate throughout the cell and attach to the centromere of each chromosome
  • 11. Metaphase
    • Each chromosome lines up at the equator of the cell
  • 12. Anaphase
    • •  Chromatids of each chromosome split and are pulled apart to opposite poles of the cell
  • 13. Telophase
    • Chromosomes become less coiled and return to the less tightly coiled chromatin
    • Nucleus and nucleolus reappear in each new cell
    • Spindle fibers disappear
  • 14. Cytokinesis
    • Cell & cytoplasm divide either by cleavage furrow in animal cells or cell plate in plant cells