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http://www.youtube.com/watch?feature=player_detailpage&v=Q6ucKWIIFmg. Cell Division. Why do cells divide?. Reproduction Growth Repair. How does the cell know how to divide?. The DNA has the instructions for all of the cell’s activities. Cell Cycle.

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youtube/watch?feature=player_detailpage&v=Q6ucKWIIFmg

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  1. http://www.youtube.com/watch?feature=player_detailpage&v=Q6ucKWIIFmghttp://www.youtube.com/watch?feature=player_detailpage&v=Q6ucKWIIFmg

  2. Cell Division Why do cells divide? • Reproduction • Growth • Repair How does the cell know how to divide? The DNA has the instructions for all of the cell’s activities.

  3. Cell Cycle The sequence of development and division of a cell 3 Parts • Interphase – Preparation • Mitosis – Cell division • Cytokinesis – Splitting • Adult human cell: ~24 hrs • 18-20 hours in interphase • 2 hours in mitosis • Embryonic cells: 30 min. How long does it take?

  4. Interphase What happens • G1-the cell grows larger • SPhase: DNA replicates (makes copies) • These are called chromatids. Centrioles appear and hold them together • G2-Organelles double in number; the cell is checked for mistakes which are corrected

  5. Mitosis: PROPHASE What happens • DNA forms chromosomes • Spindle forms • Centrioles move toward opposite poles (a clue!) • Nuclear membrane begins to disappear Draw the final picture

  6. Mitosis: METAPHASE What happens • Nucleus has disappeared completely • Chromosomes line up in the middle(a clue!) of the cell Draw the final picture

  7. Mitosis: ANAPHASE What happens • Centromeres divide • Chromatids separate and move apart(a clue!) to opposite poles Draw the final picture

  8. Mitosis: TELOPHASE What happens • Nuclear membrane forms around each group of chromosomes to begin forming two (a clue!) cells • Chromosomes unwind • Cytokinesis begins Draw the final picture

  9. Cytokinesis What happens • Cytoplasm divides (a clue!) into two cells called daughter cells Draw the final picture

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