1. How do little elephants grow up to be BIG elephants?
Bell Ringer #24 9/20/18
How do little elephants grow up to be BIG elephants?

3. Opening: Pancakes!!!
I don’t have enough batter to make pancakes for everyone. What if I add some more water to the batter? What if I add some water AND another egg?

4. Opening: Pancakes (cont.)
If a cell is going to divide, creating two “daughter” cells that are identical, what must first happen in the “parent” cell?

5. The process of asexual reproduction begins after a sperm fertilizes an egg.

6. 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.

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

8. Interphase occurs before mitosis begins
Chromosomes are copied (# doubles)
Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANE
Nucleus
Cytoplasm

9. Interphase Plant Cell Animal Cell
Photographs from:

10. Prophase 1st step in Mitosis
Mitosis begins (cell begins to divide)
Centrioles (or poles) appear and begin to move to opposite end of the cell.
Spindle fibers form between the poles.
Centrioles
Sister chromatids
Spindle fibers

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

12. Metaphase 2nd step in Mitosis
Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers

13. Metaphase Plant Cell Animal Cell
Photographs from:

14. Anaphase 3rd step in Mitosis
Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers

15. Anaphase Plant Cell Animal Cell
Photographs from:

16. Telophase 4th step in Mitosis
Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods).
Mitosis ends.
Nuclei
Nuclei
Chromatin

17. Telophase Plant Cell Animal Cell
Photographs from:

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

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

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

21. Cell Cycle

22. Mitosis Animation

23. Why do animals shed their skin?

24. Closing: Dear Absent Student
Pretend one of your friends from this class was absent today. Write him/her a letter that summarizes what we talked about in class today.
Your letter should be at least ONE paragraph long!

25. Bell Ringer #9/10 12/7/16
What would happen if cytokinesis occurred without mitosis?

26. Opening: Mitosis Video Clip

27. Work Session: Modeling Mitosis
Using your kits, model the cell division process of mitosis.

28. Closing: What’s wrong with this picture?
Interphase

29. Bell Ringer #10/11 12/8/16
Draw what happens during Metaphase in mitosis.

30. Opening: Meiosis

31. Work Session: Directed Reading
Read p
Answer Directed Reading questions on a SEPARATE sheet of paper.

32. Closing: Think-Pair-Share
How are mitosis and meiosis different and/or similar?