1. Cell Division: Mitosis
Ms. Atchley
7th Grade Science

2. WARM Up:

3. Objective: Understand the purpose of mitosis
Understand the process of mitosis
Explain the sequence and events of each phase
Introduction Video

4. Review:

5. What are the two types of cells?
Eukaryotic
Prokaryotic

6. What are prokaryotic cells?
Simple cells
Few internal structures
No membrane bound organelles
One-celled organisms, Bacteria

7. Examples of prokaryotic cell:
Bacteria
Cells

8. How do prokaryotic cells divide?
Binary Fission
(A fancy name that scientists use to impress their girlfriends or boyfriends. A process where one prokaryotic cell becomes two.)

9. What are eukaryotic cells?
Cells that contain organelles surrounded by membranes
Most living organisms

10. Examples of eukaryotic cells:
Plant
Cells
Animal
Cells
Human
Cells
Human
Cells

11. How do eukaryotic cells divide?
Mitosis!
Prophase- The cell prepares for nuclear division
Metaphase- The cell prepares chromosomes for division
Anaphase- The chromosomes divide
Telophase- The cytoplasm divides
Cytokinesis- The cell divides into two identical cells
Mitosis Phases Video

12. Making more cells for growth and repair!
What is mitosis?
The continuous process of four stages of cell division which results in the production of two identical daughter cells from a single parent cell.
Making more cells for growth and repair!

13. STOP HERE

14. Why do we study diagrams first?
Easy to identify structures
Clear
Simple

15. Are the cells really pink and purple?
Nope, they are stained so that we can see the organelles better.

16. The Phases of Mitosis
Prophase
Metaphase
Anaphase
Telophase

17. Interphase
This cell is shown, as this is how all cells look before mitosis. Please be aware that Interphase is a phase of the cell cycle, but NOT a stage of mitosis.
diagram
microscopic image

18. Prophase
The nuclear membrane breaks down, chromosomes shorten and thicken. The other structures important for mitosis are also forming
diagram
microscopic image

19. Metaphase- Middle
The spindle has now formed and the nuclear membrane has broken down. The chromosomes are lined up along the cell's center and are attached to the spindle fibers.
diagram
microscopic image

20. Anaphase- Away
The newly formed chromosomes are pulled along the spindle toward opposite poles of the cell.
diagram
microscopic image

21. Telophase
The chromosomes have finished their migration to the poles. The cell membrane pinches in along the center creating two separate cells .
The division of the cytoplasm is called cytokinesis. The division of the nucleus is Mitosis.
Microscopic
Image
diagram

22. They all look like blobs… how can we tell them apart?

23. Human Cheek Cell (40X Magnification)

24. Human Cheek Cell (40X Magnification)

25. Stages of Mitosis (with Interphase)