1. The Importance of Cell Division

2. Why would a cell want to divide?

3. Purpose of Cell Division
Three purposes of cell division:
Reproduction
Repair
Growth

4. Cell Division For Reproduction
All cells use cell division to reproduce
Each division results in two new cells

5. Involves one parent cell
Types of Cell Division
Asexual Reproduction
Involves one parent cell
Produces two identical daughter cells each with a complete set of identical genetic information

6. Examples of Asexual Reproduction
Hydra and Planaria

7. Types of Cell Division Sexual Reproduction Involves two parent cells
Each parent provides half the DNA found in the daughter cells.
Produces offspring with characteristics from both parents.

8. Cell Division for Repair
Replacement of damaged cells – cuts, broken bones.
Production of new red blood cells.

9. Cell Division for Repair
Millions of skin cells are shed
and replaced daily.

10. Cell Division for Growth
Growth is a matter of increasing the number of cells that are present
Cells getting bigger doesn’t work

11. Cell Division for Growth
Cells all need energy, nutrients, water and gases to grow.
Chemicals need to be in solution to be used.
Cells need water to use chemicals and get rid of waste.

12. Cell Division for Growth

13. Cell Division for Growth
Chemicals enter a cell across the cell membrane, and travel through the cell to where it is used.
Movement of chemicals is called
DIFFUSION

14. Cell Division for Growth
Water enters a cell across the cell membrane in a process called
OSMOSIS.

15. …why do chemical particles move?
Osmosis/Diffusion
…why do chemical particles move?
Chemicals move from an area of high concentration to low concentration.
Water moves to where the solution is more concentrated.

16. Particles will diffuse through the first cell and into the next cell.
Osmosis/Diffusion
Particles will diffuse through the first cell and into the next cell.

17. Osmosis/Diffusion
Concentration is the amount of a substance present in a given volume of water.

18. Vocabulary you need to become familiar with!
Asexual Reproduction Sexual Reproduction Diffusion Osmosis Concentration

19. Homework!
Page Questions #1 - 6

20. Microscopes Let’s read the rules! Identify parts and functions
Use Pg 605

21. Drawing Biological Diagrams
Draw a Biological diagram for the following image
Total Mag = Ocular Mag x Objective Mag x 100%

23. Switch your Work

24. Did he/she?
Name (first and last), date and teacher's name in top right hand corner
Title is appropriate
Title is underlined and centred in middle of page
Pencil is used for diagram and labels
Clean, thick, sharp lines; stippling is used for dark areas
Diagram takes up at least ½ of the page
Accurate drawing (draws what is seen)

25. Records total magnification; is correctly calculated
Total magnification is recorded under drawing
Labels are printed to the right of the diagram
Labels are aligned under each other
Label lines are drawn with a ruler and do not cross each other
All structures are labeled correctly