1. MITOSIS Why do cells reproduce? How do cells reproduce?
What controls cell division?
What is the relationship between mitosis and tumors?

3. Figure 12.3 Chromosome duplication and distribution during mitosis

4. Why do cells need to divide?
Some organisms divide in order to reproduce (asexual reproduction)
Organisms like humans rely upon cell division in order to grow, and to replace old or damaged cells

5. Mitosis Vocabulary
Mitosis - the first stage of cell division when the nucleus divides
Cytokinesis – the second stage of cell division, when the cytoplasm divide
Parent cell - the cell that is dividing
Daughter cells- the two new cells that form from mitosis

6. Mitosis Vocabulary
Centriole - a small structure located near the nucleus; it creates the spindle (in animal cells only)
Spindle - a fibrous, oval-shaped structure formed by the centrioles during mitosis
Nucleus - where DNA is found in a eukaryotic cell

8. Mitosis Vocabulary
Chromosomes (DNA threads) – genetic material within the cell that controls the cell’s activities.
Chromatids – sister strands of a replicated chromosome attached at the centromere.
Centromere - the area (near the middle) where sister chromatids are attached to each other.

10. G0

11. Cell Cycle

18. Prophase Pro- means before! Longest phase
Replicated chromosomes become shorter and thicker (condensed)
Nuclear membrane disappears
Centrioles begin to separate
The spindle (tiny threads) forms between the centrioles
Pro- means before!

19. Prophase

20. Metaphase (line up in Middle)
Shortest phase
Centrioles finish separating and the spindle is completely formed
The replicated chromosomes line up SINGLE FILE in the middle of the cell

21. Metaphase

22. Anaphase (sister chromatids pull Apart)
Sister chromatids separate
One set moves to each end or pole
Ends when chromosomes stop moving
ANA-banANA split!!

23. Anaphase

24. Telophase (makes Two new cells)
The nuclear membrane reforms around each nucleus
The spindle (tiny threads) disappears
Each centriole is located outside of each new nucleus
Chromosomes become longer and thinner and then disappear
One cell separates into two identical cells (cytokinesis)

25. Telophase

26. Cytokinesis Occurs at the same time as telophase
The cell membrane pinches inward in most animal cells

28. Mitosis in Plant Cells
Plants have no centriole, but the spindle still develops
Plant cell cytoplasm separates into two parts by the formation of a cell plate. This becomes the cell wall of the new plant cells.

29. See what you know!
The following are different stages of mitosis. See if you can identify what stage the cell is in.

30. Anaphase

31. Metaphase

32. Metaphase

33. Prophase

34. Anaphase

35. Telophase

36. Telophase

37. p
Anaphase

38. Metaphase

39. Telophase/Interphase

40. Prophase