1. KEY CONCEPT A cell’s life consists of a repeating pattern of events called the cell cycle.

2. Cell Cycle Events include:
Growth
Carrying out is job
DNA and organelle duplication
Division

3. The Cell Cycle is divided into two main stages:
Interphase and Cell Division .

4. INTERPHASE
Purpose: Grow, Carry out Job, Prepare for Cell Division
G1 - Cell growth, Do job
Duplicate organelles
S - DNA synthesis (copies DNA)
G2 - Additional growth,
Duplicate organelles
Normal functions

5. 2 Parts of Cell Division “M” Stage:
1. Mitosis
2. Cytokinesis

6. MITOSIS “Nuclear Divison” Purpose:
Divides nucleus into 2 genetically identical nuclei
4 Stages of Mitosis:
Prophase
Metaphase
Anaphase
Telophase

7. CYTOKINESIS
PURPOSE: Divide the cytoplasm to form two separate cells Animal Cell Plant Cell

8. The Final Product of the Cell Cycle……
2 Daughter Cells that are genetically identical to the parent cell – same # of chromosomes with same DNA information  
   
Start of Interphase End of Interphase/ End of Mitosis
Beginning of Mitosis End of Cytokinesis

9. Reasons Cells Divide
Growth
Replacement
Repair
Maintain size limit (surface area to volume ratio)

10. Cell size is limited.
Volume increases faster than surface area.

11. Cells divide at different rates.
The rate of cell division varies with the need for those types of cells.
Some cells are unlikely to divide (G0) Ex. Neurons (nerves).