1. The Division of Somatic Cells
Mitosis
The Division of Somatic Cells

2. Biology is the only subject in which multiplication is the same thing as division!

3. Where it all began:
You started as a cell smaller than the period at the end of this sentence. .

4. And now you are you!

5. Getting from there to here:
Going from an egg to a baby, the original fertilized egg has to divide
and divide

6. II. Why do cells divide? One-celled organisms:
For Reproduction (clones)
Example: Bacteria

7. B. Multi-celled organisms 2. For growth & development
From fertilized egg to adult
Example: Growing more muscle or fat
3. For repair & replacement
Replace cells that die from normal wear and tear or from injury
Example: Repairing a cut

8. Summary Slide

9. III. How cells divide? Stages of Mitosis

10. A. Interphase
Cell spends most of its time here growing and doing normal jobs
Cell copies DNA during interphase (replication)

11. B. Prophase DNA winds into chromosomes
This keeps DNA organized as the nucleus disappears.

13. Prophase

14. C. Metaphase Chromosome line up in the middle
Attached to protein “cables” that will help them move (spindles)

15. Metaphase

16. D. Anaphase
Chromosomes separate and start to move to opposite ends

17. Anaphase

18. E. Telophase
Cell starts to divide
2 nucleus form!

19. Telophase

20. Telophase

21. F. Cytokinesis DNA unwinds again Cytoplasm divides
2 new cells can now do their everyday jobs

22. IV. The results of MITOSIS
2 new daughter cells
Get 2 exact copies of the original cells
Same DNA
“Clones”

23. Video of Mitosis

24. Summary Slide

25. A. Cancer
A mistake in the cell cycle that is the result of uncontrolled cell division

26. Cancerous cells for masses of tissues called tumors
Cancerous cells for masses of tissues called tumors. These take nutrients away from normal cells.

27. Benign Tumors Benign tumors are nondangerous/noncancerous tumors
Cells of the tumor are normal and there is no danger of them invading other tissues… yet!!!

28. Malignant Tumors
Malignant tumors are cancerous cells that have different shapes and will invade or destroy other tissues

29. If malignant cells go undetected…
Then the cancer has the ability to enter the circulatory system (the blood stream) and spread through the body. This is called metastasis

32. Cancer Prevention Live a healthy lifestyle
Eat lots of fruits, veggies, and grains
Exercise
Visit the doctors for checkups, especially if a type of cancer runs in your family