07 Mitosis

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07 Mitosis

  1. 1. MITOSIS
  2. 2. Mitosis The process of cell division which results in the production of two daughter cells from a single parent cell. The daughter cells are identical to one another and to the original parent cell.
  3. 3. Mitosis can be divided into stages <ul><li>Interphase </li></ul><ul><li>Prophase </li></ul><ul><li>Metaphase </li></ul><ul><li>Anaphase </li></ul><ul><li>Telophase & Cytokinesis </li></ul>
  4. 4. Interphase The cell prepares for division <ul><li>Animal & Plant Cells </li></ul><ul><ul><li>Nucleus clearly defined </li></ul></ul><ul><ul><li>Chromosomes not yet visible </li></ul></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>2N - 4N
  5. 5. Interphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  6. 6. Prophase The cell prepares for nuclear division <ul><li>Animal & Plant Cells </li></ul><ul><ul><li>DNA packaged in to chromosomes </li></ul></ul><ul><ul><li>Nuclear envelope disappears </li></ul></ul><ul><ul><li>Centrioles move to opposite sides of the cell </li></ul></ul>4N
  7. 7. Prophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  8. 8. Metaphase The cell prepares chromosomes for division <ul><li>Animal & Plant Cells </li></ul><ul><ul><li>Chromosomes line up at the center of the cell </li></ul></ul><ul><ul><li>Spindle fibres attach to centromeres on the chromosomes </li></ul></ul><ul><ul><li>Centrioles reach the opposite poles of the cell </li></ul></ul>4N
  9. 9. Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  10. 10. Anaphase The chromosomes divide <ul><li>Animal & Plant Cells </li></ul><ul><ul><li>Spindle fibers contract and pull chromosomes apart </li></ul></ul><ul><ul><li>½ of each chromosome (called a chromatid) moves to each hemisphere </li></ul></ul><ul><ul><li>Unattached spindle fibres push against each other or the sides of the cell, and it begins to elongate </li></ul></ul>4N
  11. 11. Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  12. 12. Telophase The cytoplasm divides <ul><li>Animal Cell </li></ul><ul><ul><li>DNA spreads out </li></ul></ul><ul><ul><li>2 nuclei form </li></ul></ul><ul><ul><li>Contractile ring causes a cleavage furrow to form the 2 new daughter cells </li></ul></ul><ul><li>Plant Cell </li></ul><ul><ul><li>DNA spreads out </li></ul></ul><ul><ul><li>2 nuclei form </li></ul></ul><ul><ul><li>Cell plate forms new cell wall between the nuclei to form the 2 new daughter cells </li></ul></ul>4N - 2N
  13. 13. Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  14. 14. Mitosis Animations Mitosis.exe Mitosis Animation
  15. 15. Animal Mitosis -- Review Interphase                                                               Telophase                                                               Anaphase                                                               Metaphase                                                               Prophase                                                               Interphase                                                              
  16. 16. Plant Mitosis -- Review Interphase                                                               Telophase                                                               Anaphase                                                               Metaphase                                                               Prophase                                                               Interphase                                                              
  17. 17. Summary of Mitosis <ul><li>Prophase: </li></ul><ul><ul><ul><li>Chromosomes condense </li></ul></ul></ul><ul><ul><ul><li>Nuclear envelope disappears </li></ul></ul></ul><ul><ul><ul><li>centrosomes move to opposite sides of the cell </li></ul></ul></ul><ul><ul><ul><li>Spindle forms and attaches to centromeres on the chromosomes </li></ul></ul></ul><ul><li>Metaphase </li></ul><ul><ul><ul><li>Chromosomes lined up on equator of spindle </li></ul></ul></ul><ul><ul><ul><li>centrosomes at opposite ends of cell </li></ul></ul></ul><ul><li>Anaphase </li></ul><ul><ul><ul><li>Centromeres divide: each 2-chromatid chromosome becomes two 1-chromatid chromosomes </li></ul></ul></ul><ul><ul><ul><li>Chromosomes pulled to opposite poles by the spindle </li></ul></ul></ul><ul><li>Telophase </li></ul><ul><ul><ul><li>Chromosomes de-condense </li></ul></ul></ul><ul><ul><ul><li>Nuclear envelope reappears </li></ul></ul></ul><ul><ul><ul><li>Cytokinesis: the cytoplasm is divided into 2 cells </li></ul></ul></ul>

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