The importance of cell division
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The Importance of Cell Division. Why would a cell want to divide?. Purpose of Cell Division. Three purposes of cell division: Reproduction Repair Growth. Cell Division For Reproduction. All cells use cell division to reproduce Each division results in two new cells.

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Purpose of cell division
Purpose of Cell Division

Three purposes of cell division:

  • Reproduction

  • Repair

  • Growth


Cell division for reproduction
Cell Division For Reproduction

  • All cells use cell division to reproduce

  • Each division results in two new cells


Types of cell division
Types of Cell Division

  • Asexual Reproduction

    • Involves one parent cell

    • Produces two identical daughter cells each with a complete set of identical genetic information



Types of cell division1
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.


Cell division for repair
Cell Division for Repair

  • Replacement of damaged cells – cuts, broken bones.

  • Production of new red blood cells.


Cell division for repair1
Cell Division for Repair

  • Millions of skin cells are shed

    and replaced daily.


Cell division for growth
Cell Division for Growth

  • Growth is a matter of increasing the number of cells that are present

  • Cells getting bigger doesn’t work


Cell division for growth1
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.



Cell division for growth3
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


Cell division for growth4
Cell Division for Growth

  • Water enters a cell across the cell membrane in a process called

    OSMOSIS.


Osmosis diffusion
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.


Osmosis diffusion1
Osmosis/Diffusion

Particles will diffuse through the first cell and into the next cell.


Osmosis diffusion2
Osmosis/Diffusion

Concentration

is the amount of a substance present in a given volume of water.


Vocabulary you need to become familiar with
Vocabulary you need to become familiar with!

Asexual Reproduction

Sexual Reproduction

Diffusion

Osmosis

Concentration


Homework
Homework!

Page 37 Questions #1 - 6


Microscopes
Microscopes

  • Let’s read the rules!

  • Identify parts and functions

    • Use Pg 605


Drawing biological diagrams
Drawing Biological Diagrams

  • Draw a Biological diagram for the following image

  • Total Mag = Ocular Mag x Objective Mag x 100%



Did he she
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)


  • 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


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