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Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
Cell Division
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Cell Division

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

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