1. Cell Growth Cell Cycle Chapter 10

2. Cell Cycle Events of the Cell Cycle

3. Cell Cycle  The cell cycle is the series of events that cells go through as they grow and divide.  Interphase is the period of growth that occurs between cell divisions.  90% of the cell ’ s time is spent in interphase

4. During the Cell Cycle  a cell grows  prepares for division  divides to form two daughter cells, each of which begins the cycle again

5. The Cell Cycle  The cell cycle consists of four phases: G1 S G2 M

6. Interphase  Consists of 3 of these 4 phases. G 1 (First Gap Phase) S Phase (synthesis) G 2 (Second Gap Phase)

7. M phase Cell division or Mitosis Phase Refers to the division of the nucleus Consists of 4 steps  Prophase  Metaphase  Anaphase  Telophase

8. Events of the Cell Cycle During G 1= First Gap, phase the cell  increases in size  synthesizes new proteins and organelles During the S = Synthesis phase  chromosomes are replicated  DNA synthesis takes place  Once a cell enters the S phase, it usually completes the rest of the cell cycle.

9. Events of the Cell Cycle  The G 2 Phase (Second Gap Phase)  organelles and molecules required for cell division are produced  Once G 2 is complete, the cell is ready to start the M phase—Mitosis