1. Mitosis
What is it?
Why is it Important?
What do I need to know?

2. Where did these cells come from?

3. Why do cells divide?
Cell division happens in all organisms.
reproduction
growth or repair

4. Why do cells divide?
Important fact
In unicellular organisms, cell division is important for reproduction. To create another organism, they just divide into two.

5. Why do cells divide?
Important fact
In multicellular organisms, cells divide to allow the organisms to grow, repair or replace cells.

6. cell cycle – the life cycle of a eukaryotic cell.
vocabulary
word!
cell cycle – the life cycle of a eukaryotic cell.
Cells have a life span. They live and die like any living thing.
To grow and remain healthy, cells need to divide and replace themselves frequently.

8. The cell cycle has three phases: interphase mitosis cytokinesis
Important fact
The cell cycle has three phases:
interphase
mitosis
cytokinesis

9. interphase
vocabulary
word!
interphase –when the cell is performing its job for the organism. A cell spends 95% of its time in interphase.

10. DNA
Important fact
DNA is a molecule that determines the traits of a living organism. It makes us who we are and is found in the nucleus of each cell.

11. At the end of interphase, the DNA makes an exact copy of itself.
DNA replication
Important fact
At the end of interphase, the DNA makes an exact copy of itself.

12. Chromosomes duplicate

13. mitosis
vocabulary
word!
mitosis – part of the cell cycle when the nucleus divides. At the end of mitosis, there are two identical nuclei in the cell.

14. There are four phases in mitosis: Prophase – chromosomes darken
Important fact
There are four phases in mitosis:
Prophase – chromosomes darken
Metaphase - middle
Anaphase - <>
Telophase – two nuclei

15. prophase
vocabulary
word!
prophase - the chromatin in the nucleus condenses into chromosomes. The membrane around the nucleus breaks down.

18. PROPHASE
Allium root tip
Coregonus blastula

19. metaphase - the chromosomes line up in the middle of the cell.
vocabulary
word!
metaphase - the chromosomes line up in the middle of the cell.

20. Spindle fibers form

21. METAPHASE
Allium root tip
Coregonus blastula

22. anaphase
vocabulary
word!
anaphase - the chromosomes separate. They are pulled to opposite sides of the cell so each side has an identical copy.

24. ANAPHASE
Allium root tip
Coregonus blastula

25. telophase
vocabulary
word!
telophase - a new nuclear membrane forms around each group of chromosomes. The cell briefly has two nuclei.

27. TELOPHASE
Allium root tip
Coregonus blastula

28. cytokinesis – the division of the cytoplasm and cell organelles.
vocabulary
word!
cytokinesis – the division of the cytoplasm and cell organelles.

30. INTERPHASE
Allium root tip
Coregonus blastula

31. 95%

36. Mitosis produces identical offspring (2N---2N)

37. Name stage of mitosis
prophase

38. Name stage of mitosis

39. Name stage of mitosis

40. Name stage of mitosis

41. Name stage of mitosis

42. Name stage of mitosis

43. Name stage of mitosis

44. Name stage of mitosis

45. Mitosis

46. Cells Alive demo http://www.cellsalive.com/mitosis.htm