1. Why do animals shed their skin?

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

3. CELL DIVISION

4. Sexual Reproduction Human Life begins with sexual reproduction
Sexual Reproduction is a mixing of DNA from two different organisms.

5. Fertilization
When sperm meets egg they merge into one cell with a new set of DNA
(46 chromosomes).

6. Asexual Reproduction is making an EXACT copy of DNA.
The process of asexual reproduction begins after a sperm fertilizes an egg.

7. 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.
Cell that reproduce by asexual reproduction reproduce constantly.

8. Animated Mitosis Cycle
Interphase
Prophase
Metaphase
Anaphase
Telophase & Cytokinesis

9. 1 st: Interphase occurs before mitosis begins
Chromosomes make EXACT copies of themselves. (# doubles)
The process is called replication.
CELL MEMBRANE
Nucleus
Cytoplasm

10. Interphase Plant Cell Animal Cell
Photographs from:

11. 2nd: Prophase Mitosis begins (cell begins to divide)
Nucleus prepares for cell division.
Original Chromosome and its copy link together like an X
Centrioles
Sister chromatids
Spindle fibers

12. Prophase Plant Cell Animal Cell Spindle fibers Centrioles
Photographs from:

13. 3rd: Metaphase 2nd step in Mitosis
The original chromosomes and the copies attach to the spindle fibers.
They line up in the center of the cell.
Centrioles
Spindle fibers

14. Metaphase Plant Cell Animal Cell
Photographs from:

15. 4th phase: Anaphase The chromosomes and the copies separate. ‘
They are pulled to opposite sides of the cell.
A new nucleus begins to form around each set of chromosomes.
Centrioles
Spindle fibers

16. Anaphase Plant Cell Animal Cell
Photographs from:

17. 5th: Telophase Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods).
Mitosis ends.
Nuclei
Nuclei
Chromatin

18. Telophase Plant Cell Animal Cell
Photographs from:

19. Cytokinesis occurs after mitosis
Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

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

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

22. Cell Cycle

23. - Cell Division
The Cell Cycle 24

24. Mitosis Animation