1. Mitosis
Cell division

2. Mitosis = Cell Division
We all began as one cell… how did we grow to the size we are today? CELL DIVISION!
Cell division allows us to grow
The body uses mitosis to replace dead or damaged cells

3. Mitosis
Single cells are reproduced- one parent cell divides to produce two identical daughter cells
DNA is duplicated and an exact copy of chromosomes are passed to each daughter cell
Occurs in all cell types except sex cells
Parent Cell
Daughter Cells

4. Cell Cycle: G M Cytokinesis

5. Stages of Mitosis
Use your textbook to complete the following chart on the stages of mitosis
Stage
Features
Sketch

8. Checkpoints
The cell uses proteins to tell the nucleus when it can divide
Signals NOT to divide
Signals from surrounding cells tell cell not to divide
There are not enough nutrients for cell
DNA has not replicated
DNA is damaged

9. Why can’t a human be one huge cell?
Surface area to volume ratio
If the cell is too large, diffusion to get nutrients IN and waste OUT will take too long

10. Difference between Osmosis and Diffusion
Diffusion is the movement of particles of a substance from area of high concentration to an area of low concentration.
Example: Substances travelling from one cell to another
Osmosis: The movement of water across a membrane.