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Chpt9.2 mitosis


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Chpt9.2 mitosis

  1. 1. Phases of the Cell Cycle Pgs. 246-252 Interphase – G1 Rapid growth & activity Interphase – S Growth & DNA replication Interphase – G2 Growth & prep for mitosis,centrioles Prophase Chromosomes become visible Metaphase Chromosomes line up across center Anaphase Chromatids separate & move to ends Telophase Nuclear division is completed Cytokinesis Division of the cytoplasm
  2. 2. Interphase <ul><li>Busiest part of the cell cycle </li></ul><ul><li>Cells make ATP </li></ul><ul><li>Repair themselves </li></ul><ul><li>Excrete wastes </li></ul><ul><li>Make proteins </li></ul><ul><li>Produce new organelles </li></ul><ul><li>Copy chromosomes </li></ul>
  3. 3. Prophase <ul><li>Longest phase of mitosis </li></ul><ul><li>Chromatin coils into visible chromosomes </li></ul><ul><li>Nucleus begins to disappear </li></ul><ul><li>Centrioles migrate to opposite ends of the cell </li></ul><ul><li>Spindle fibers are formed between the centrioles </li></ul>
  4. 4. Metaphase <ul><li>Shortest phase </li></ul><ul><li>Chromosomes line up across the center of the cell </li></ul><ul><li>Microtubules (spindle fiber) attach to centromeres </li></ul>
  5. 5. Anaphase <ul><li>Centromeres split </li></ul><ul><li>Sister chromatids are pulled apart to opposite poles of the cell. </li></ul>
  6. 6. Telophase <ul><li>Final phase </li></ul><ul><li>Nuclear envelope and nucleous reappear </li></ul><ul><li>Chromosomes begin to uncoil </li></ul><ul><li>Double membrane </li></ul><ul><li>begins to form </li></ul><ul><li>Nuclear division is </li></ul><ul><li>complete </li></ul>
  7. 7. Cytokinesis (late telophase) <ul><li>Division of the cytoplasm occurs </li></ul><ul><li>2 daughter cells are formed </li></ul><ul><li>Each new cell has a complete set of chromosomes </li></ul><ul><li>New cell begins interphase </li></ul>
  8. 8. Cell Cycle Animation
  9. 9. Cell Cycle
  10. 10. Mitosis Video