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Mitosis notes (cell cycle) for blog


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Mitosis notes (cell cycle) for blog

  1. 1. Biology Cell Reproduction Notes
  2. 2. <ul><li>New cells are created in your body every day. Think of three reasons why your body might need new cells. </li></ul>
  3. 3. <ul><li>Unicellular organisms - asexual reproduction </li></ul><ul><li>Multicellular organisms- growth & repair. </li></ul>
  4. 5. Cell Cycle <ul><li>Interphase - the longest part of the cell cycle: growth, metabolism & preparation for division occurs. Chromosomes are replicated. (S phase) </li></ul><ul><li>Mitosis - the division of the nucleus. </li></ul><ul><li>Cytokinesis - the division of the cytoplasm. </li></ul>
  5. 6. The Steps of Mitosis <ul><li>PMAT (remember the order that they occur) </li></ul><ul><li>Mitosis produces two cells with the same number of chromosomes. </li></ul>
  6. 7. Prophase (Preparing) <ul><li>Longest phase of mitosis </li></ul><ul><li>Nuclear envelope & nucleous disappears. </li></ul><ul><li>Chromosomes become visible. </li></ul><ul><li>Centrioles (animal cell) form and move to opposite poles of cell </li></ul><ul><li>Spindle fibers form from centrioles, cross cell and attach to the chromosomes. </li></ul>
  7. 8. Metaphase (middle) <ul><li>Chromosomes line up in the middle of the cell. </li></ul><ul><li>Spindles are attached to them. </li></ul>
  8. 9. Anaphase (Apart) <ul><li>Spindle fibers begin to shorten. </li></ul><ul><li>This pulls chromosomes apart. </li></ul><ul><li>Chromosome halves are now referred to as chromatids. </li></ul>
  9. 10. Telophase (Two cells) <ul><li>Chromatids reach poles. </li></ul><ul><li>Chromosomes become chromatin. </li></ul><ul><li>Spindle fibers break down. </li></ul><ul><li>Nucleolus and nuclear envelope appear. </li></ul>
  10. 11. Cytokinesis (happens during telophase) <ul><li>Division of cytoplasm </li></ul><ul><li>In animal cells: cell membrane continues to pinch in until two cells are formed </li></ul><ul><li>In plant cells: cell plate forms in center of cell and eventually splits cells </li></ul><ul><li>At the end of mitosis, two new “daughter” cells are produced. </li></ul>