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I. MITOSIS

Learn about mitosis, the process of cell division necessary for normal growth, repair, and development. Understand the stages of the cell cycle, including interphase and mitosis. Discover the significance of mitosis in producing two daughter cells with identical DNA.

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I. MITOSIS

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  1. I. MITOSIS A. Cell Division: 1. Needed for normal growth, repair, & development 2. Occurs in somatic cells (body cells) 3. Daughter cells have an exact copy of DNA of parent cell 4. Each parent cell produces 2 daughter cells

  2. B. Why Do Cells Divide? 1. Volume Limit: a) food intake b) waste removal 2. Volume to Surface Area Ratio -Volume increases much more rapidly than surface area as the cell grows in size

  3. II. Cell Cycle

  4. A. Interphase 1. Not part of Mitosis 2. 90 % time here 3. Carries out metabolic processes: • Making new molecules & organelles • Normal growth/development • Cell prepare for division 4. DNA replication 5. Chromosomes are not distinguishable (chromatin) 6. Prepares for cell division

  5. 7. Cell Cycle: 1. G1 phase (normal growth) 2. S phase (synthesis) 3. G2: prepares to divide 4. Mitosis/Cytokineses

  6. Mitosis Begins Cell Cycle Continues

  7. B. Prophase 1. First stage of mitosis 2. Chromosomes appear (shorten & thicken = sister chromatids) 3. Centrioles, spindle fibers appear 4. Nuclear membrane dissolves

  8. C. Metaphase 1. Chromosomes line up at the equator

  9. D. Anaphase 1. Chromosomes separate and migrate to the opposite ends of the cell

  10. E. Telophase 1. Reorganization spindle fibers disappear b) nuclear membrane forms 2. Chromosomes lengthen & disappear 3. Cytoplasm splits (cytokinesis) into two daughter cells • Cell Plate forms for plant cells

  11. F. Significance 1. TWO Daughter cells 2. Identical DNA to parent cell 3. Healing • Growth • Mitosis Animation

  12. G. Cell Cycle • From Individual Daughter cell  complete cell division • Two Parts: a. Interphase: G1, S, G2 b. Mitosis/Cytokinesis

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