cell cycle and mitosis

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cell cycle and mitosis

  1. 1. Cell Cycle
  2. 2. Cell Cycle <ul><li>-life of a cell </li></ul><ul><li>-from its origin in the division of parent cell until its own division into two cells </li></ul>
  3. 3. Why do cells divide? <ul><li>growth </li></ul><ul><li>renewal and </li></ul><ul><li>repair </li></ul>
  4. 4. <ul><li>Repeating sequence of cellular growth and division throughout the life of an organism </li></ul>What is cell cycle?
  5. 5. <ul><ul><li>Interphase </li></ul></ul><ul><ul><li>(90 %) </li></ul></ul><ul><ul><li>Gap 1 (G1) </li></ul></ul><ul><ul><li>S (synthesis) </li></ul></ul><ul><ul><li>Gap 2 (G2) </li></ul></ul><ul><ul><li>Mitotic phase </li></ul></ul><ul><ul><li>Mitosis </li></ul></ul><ul><ul><li>Cytokinesis </li></ul></ul>Cell Cycle Stages
  6. 7. Interphase The cell prepares for division <ul><li>Animal Cell </li></ul><ul><ul><li>DNA replicated </li></ul></ul><ul><ul><li>Organelles replicated </li></ul></ul><ul><ul><li>Cell increases in size </li></ul></ul><ul><li>Plant Cell </li></ul><ul><ul><li>DNA replicated </li></ul></ul><ul><ul><li>Organelles replicated </li></ul></ul><ul><ul><li>Cell increases in size </li></ul></ul>
  7. 8. Interphase Animal Cell Plant Cell
  8. 9. Mitotic phase <ul><li>mitosis </li></ul><ul><li>division of the nucleus </li></ul><ul><li>happens on all somatic cells </li></ul><ul><li>cytokinesis </li></ul><ul><li>division of the cytoplasm </li></ul><ul><li>Shortest part of the cycle </li></ul><ul><li>Mitosis has 4 subphases: </li></ul><ul><li>prophase </li></ul><ul><li>metaphase </li></ul><ul><li>anaphase </li></ul><ul><li>telophase </li></ul>
  9. 11. Stages of Mitotic phase Prophase Metaphase Anaphase Telophase Cytokinesis
  10. 12. Prophase <ul><li>Chromatin thickens into chromosomes </li></ul><ul><li>Centriole pairs move to opposite ends of the cell </li></ul><ul><li>Spindle fibers begin to form </li></ul><ul><li>Nuclear membrane & </li></ul><ul><li>nucleoli disintegrates </li></ul>
  11. 13. Prophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  12. 14. Metaphase <ul><li>Chromosomes align along the metaphase plate </li></ul><ul><li>Chromosomes attached to the spindle fiber through the centromere </li></ul>
  13. 15. Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  14. 16. Anaphase <ul><li>Paired chromosomes separate and move to opposite sides of the cell </li></ul><ul><li>Separation of centromeres </li></ul><ul><li>Separated chromosomes are called daughter chromosomes </li></ul>
  15. 17. Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  16. 18. Telophase <ul><li>Chromatids arrive at opposite poles of cell </li></ul><ul><li>Spindle fibers disintegrate </li></ul><ul><li>Nuclear membrane reforms </li></ul><ul><li>Nucleoli reappear </li></ul>
  17. 19. <ul><li>Plant cells: cell plate </li></ul><ul><li>Animals: cleavage furrow </li></ul>Telophase
  18. 20. Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Cleavage furrow Cell plate
  19. 21. Cytokinesis <ul><li>Cytoplasm divides </li></ul><ul><li>Produces two daughter cells , each with one nucleus </li></ul>
  20. 22. Result of Cell Cycle <ul><li>two new daughter cells </li></ul><ul><ul><li>identical to the parent cell in chromosome number and chromosome type </li></ul></ul><ul><li>two new daughter cells will enter interphase and the cycle will continue…  </li></ul>
  21. 23. THANK YOU! <ul><li>Reference: revised from: http://team.zobel.dlsu.edu.ph/sites/students/H1/Lists/Announcements/Attachments/201/Cell%20Cycle.ppt . </li></ul>

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