1. GENETICS

2. Mitosis and the Cell Cycle
Cell reproduction

3. How do little elephants grow up to be BIG elephants?

4. Why do animals shed their skin?

5. Three reasons why cells reproduce by asexual reproduction: 1. Growth 2
Three reasons why cells reproduce by asexual reproduction: Growth Repair Replacement
Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.

6. Animated Mitosis Cycle
As you can see Mitosis is a continuous cycle and does not stop at each phase like shown in the picture.

7. The Cell Cycle The sequence of growth and division of a cell.
95% of cell cycle
in interphase
5% of cell cycle
in mitosis

8. Interphase Growth Stage 1 (G1) – metabolic activity of the cell
Synthesis Stage (S) – metabolic activity of the cell, replication of DNA
Growth Stage 2 (G2) – metabolic activity of the cell, prepare for division

9. Interphase Plant Cell Animal Cell
Photographs from:

10. MITOSIS There are PROPHASE four phases METAPHASE of mitosis. ANAPHASE
TELOPHASE

11. Prophase Nuclear membrane fades
Chromosomes condense – can see sister chromatids
and centromere
Spindle fibers form
Centrioles start to move
to opposite poles

12. Prophase Plant Cell Animal Cell Spindle fibers No Centrioles
microtubules
Photographs from:

13. Metaphase Chromosomes line up along the equator (middle) of the cell
Each chromatid is attached to spindle with centromere

14. Metaphase Plant Cell Animal Cell
Photographs from:

15. Anaphase Centromeres divide
Sister chromatids are pulled apart to opposite poles of the cell
Each chromatid is now a separate chromosome

16. Anaphase Plant Cell Animal Cell
Photographs from:

17. Telophase Spindle fibers dissolve
Chromosomes reach the opposite poles and begin to uncoil (lengthen)
Nuclear envelopes (2) reform

18. Telophase Plant Cell Animal Cell
Photographs from:

19. Cytokinesis
Cytoplasm divides
Two new daughter cells are now separate

20. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

21. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase