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C e l l C y c l e a n d M i t o s i s !

C e l l C y c l e a n d M i t o s i s !

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C e l l C y c l e a n d M i t o s i s !

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  1. CellCycleandMitosis!

  2. Review  Why do cells divide?? Big cells are inefficient! Nutrients can’t reach the organelles! Volume increases much faster than surface area! Proteins can’t be synthesized quickly enough!

  3. Before Cells Divide… • INTERPHASE! • Cells carry out normal functions • Most of a cell’s time is spent in this phase • 3 parts!  G1, S, and G2

  4. G1 PHASE • DNA stored as chromatin loose and unwound • Cell grows and organelles replicate S PHASE • Synthesis • DNA replicates G2 PHASE • Rapid growth before division

  5. INTERPHASE

  6. Now the cell is ready to divide! • MITOSIS: The division of the nucleus! • 4 Phases!

  7. PROPHASE • DNA condenses into chromosomes • Nucleus disappears • Spindle fibers form • Centrioles move to side

  8. PROPHASE:

  9. METAPHASE • Chromosomes line up down the middle of the cell • Spindle fibers attach to centromere

  10. METAPHASE

  11. ANAPHASE • Chromatids separate • Spindle fibers pull chromosomes to the sides

  12. ANAPHASE

  13. TELOPHASE • Cleavage Furrow forms • Nucleus reforms • DNA unravels • Centrioles and spindle fibers disappear

  14. TELOPHASE

  15. Quick Mitosis Summary… • Mitosis Division of the nucleus • 1 Prophase • 2 Metaphase • 3 Anaphase • 4 Telophase • Ready for the last part of the cell cycle???

  16. CYTOKINESIS! • Division of the cytoplasm • Cell splits into 2 new cells! • NOT a part of mitosis Cleavage Furrow Cell Plate

  17. The Cell Cycle!

  18. The Cell Cycle:

  19. The Cell Cycle: