Mitosis Final

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Mitosis Final

  1. 1. Mitosis Chapter 10
  2. 2. Depending on cell type… <ul><li>Mitosis can take a few minutes or a few days </li></ul><ul><li>Muscle cells </li></ul><ul><li>Nerve cells </li></ul><ul><li>Skin cells </li></ul><ul><li>Digestive Tract cells </li></ul>
  3. 3. Prophase <ul><li>50-60% of time </li></ul><ul><li>Chromosomes become visible </li></ul><ul><li>Centrioles develop in cytoplasm near nuclear envelope </li></ul><ul><li>Centrioles separate and migrate to opposite ends of nuc. Env. </li></ul><ul><li>Centrosome </li></ul><ul><ul><li>Region where Centrioles are found </li></ul></ul><ul><ul><li>Organize the “spindle” </li></ul></ul><ul><ul><ul><li>Fan like microtubule structure that helps separate chromosomes </li></ul></ul></ul><ul><li>Plants do NOT have Centrioles </li></ul>
  4. 6. End of prophase <ul><li>Chromosomes coil together tightly </li></ul><ul><li>Nucleolus disappears </li></ul><ul><li>Nuclear envelope breaks down </li></ul>
  5. 7. Metaphase <ul><li>Few minutes </li></ul><ul><li>Chromosomes line up in middle (M in metaphase  MIDDLE) </li></ul><ul><li>Microtubules connect centromere of each chromosome to the 2 poles of spindle </li></ul>
  6. 11. Anaphase <ul><li>Centromeres joining sister chromatids separate and become individual chromosomes </li></ul><ul><li>They are dragged by fibers to opposite poles </li></ul><ul><li>Ends when chromosomes stop moving </li></ul>
  7. 15. Telophase <ul><li>Opposite of prophase </li></ul><ul><li>Condensed chromosomes disperse into tangle of material </li></ul><ul><li>Nuclear envelope reforms </li></ul><ul><li>Spindle breaks apart </li></ul><ul><li>Nucleolus becomes visible </li></ul><ul><li>At the end  2 identical nuclei in one cell </li></ul>
  8. 19. Cytokinesis <ul><li>Happens at the same time as Telophase </li></ul><ul><li>Division of cytoplasm </li></ul><ul><li>Animal Cells </li></ul><ul><ul><li>Cell membrane drawn inward until it pinches off and forms 2 id daughter cells </li></ul></ul><ul><li>Plant Cells </li></ul><ul><ul><li>Cell plate forms between nuclei </li></ul></ul><ul><ul><li>Cell Plate develops into separate membrane </li></ul></ul><ul><ul><li>Cell wall appears </li></ul></ul>

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