1. Cell Cycle Overview
Chapter 12

2. Cell Cycle
The life of a cell from when it is first formed to when it divides
Cells form new cells through cell division
Part of the cell theory!

3. Cell Cycle

4. Interphase Divided into 3 sections or phases G1 phase – first gap
Cell grows
S phase – synthesis
Cell grows & copies its chromosomes
Takes the longest amount of time
G2 phase – second gap
Cell grows & prepares for cell division

5. Mitotic (M) Phase Divided into 2 sections or phases
Mitosis
Chromosomes are divided into two new cells
Broken down into 4-5 phases
Cytokinesis
Cytoplasm is divided to form two new daughter cells
Takes the least amount of time

6. Cell Cycle

7. Not All Cells Divide…
If a cell is not going to divide it spends most of its life in G0
G0 – the cell does not grow or prepare to divide, it just functions normally
Cell enters G0 after completing G1

8. Cell Division - Growth
Organisms grow, add new cells, through cell division

9. Cell Division - Repair
Cell division replaces dead or damaged cells in multicellular organisms
Ex. Bone marrow cells divide to make new blood cells

10. Cell Division - Reproduction
Unicellular organisms reproduce by cell division
Makes a new organism by dividing
Mitosis (eukaryotes)
Binary fission (prokaryotes)
Multicellular organisms make gametes (sperm & eggs) through a special type of cell division (meiosis)