1. The Cell Cycle

2. Stages of the Cell Cycle
First Growth (G1) Phase
Synthesis (S) Phase
Second Growth (G2) Phase
Mitosis (M)
Cytokinesis (C)

3. The Cell Cycle: Interphase
A cell spends (90%) of its time in Interphase
First Growth (G1) Phase: cell grows rapidly and carries out its routine functions.
Cells that are not dividing remain in the G1 phase.
Synthesis (S) Phase: cell’s DNA is copied.
Second Growth (G2 )Phase: preparations are made for the nucleus to divide.

4. process during cell division in which the cytoplasm divides.
Final Stages
Mitosis: process during cell division in which the nucleus of a cell is divided into two nuclei.
Cytokinesis:
process during cell division in which the cytoplasm divides.

5. Importance of Mitosis and Cytokinesis
Mitosis and Cytokinesis produce new cells that are identical to the original cells and allow organisms to grow, replace damaged tissues, and, in some organisms, reproduce asexually.

6. How do cells know when to divide?
How is the cell cycle controlled?

7. Check Points
Checkpoints control the phases of the cell cycle and send feedback signals to trigger the next phase of the cell cycle.
Three important checkpoints : end of G1 phase, end of G2 phase, and halfway through mitosis.