1. End Show Slide 1 of 38 Copyright Pearson Prentice Hall 10-2 Cell Division

2. End Show 10-2 Cell Division Slide 2 of 38 Copyright Pearson Prentice Hall The Cell Cycle Cell Cycle The cell cycle is the series of events that cells go through as they grow and divide. Interphase is the period of growth that occurs between cell divisions.

3. End Show 10-2 Cell Division Slide 3 of 38 Copyright Pearson Prentice Hall The Cell Cycle During the cell cycle: a cell grows prepares for division divides to form two daughter cells

4. End Show 10-2 Cell Division Slide 4 of 38 Copyright Pearson Prentice Hall The Cell Cycle The cell cycle consists of four phases: G 1 S Phase G 2 M Phase

5. End Show 10-2 Cell Division Slide 5 of 38 Copyright Pearson Prentice Hall Events of the Cell Cycle During G 1, the cell increases in size synthesizes new proteins

6. End Show 10-2 Cell Division Slide 6 of 38 Copyright Pearson Prentice Hall Events of the Cell Cycle During the S phase, chromosomes & centrioles are replicated

7. End Show 10-2 Cell Division Slide 7 of 38 Copyright Pearson Prentice Hall Events of the Cell Cycle The G 2 Phase (Second Gap Phase) organelles and molecules required for cell division are produced

8. End Show 10-2 Cell Division Slide 8 of 38 Copyright Pearson Prentice Hall Cell Cycle Events of the Cell Cycle

9. End Show 10-2 Cell Division Slide 9 of 38 Copyright Pearson Prentice Hall Cell division phases: The first stage, division of the cell nucleus, is called mitosis. The second stage, division of the cell cytoplasm, is called cytokinesis. Cell Division

10. End Show 10-2 Cell Division Slide 10 of 38 Copyright Pearson Prentice Hall Chromosomes Genetic information is passed from one generation to the next on chromosomes.

11. End Show 10-2 Cell Division Slide 11 of 38 Copyright Pearson Prentice Hall Chromosomes Each chromosome consists of two identical “sister” chromatids. Each pair of chromatids is attached at an area called the centromere. When the cell divides, the chromatids separate. Each new cell gets one chromatid. Sister chromatids Centromere

12. End Show 10-2 Cell Division Slide 12 of 38 Copyright Pearson Prentice Hall Figure 9.7 figure 09-07.jpg

13. End Show 10-2 Cell Division Slide 13 of 38 Copyright Pearson Prentice Hall Mitosis Biologists divide the events of mitosis into four phases: Prophase Metaphase Anaphase Telophase

14. End Show 10-2 Cell Division Slide 14 of 38 Copyright Pearson Prentice Hall Mitosis

15. End Show 10-2 Cell Division Slide 15 of 38 Copyright Pearson Prentice Hall Section 10-2 Prophase Spindle forming Chromosomes (paired chromatids) Centromere Click to Continue Mitosis Prophase

16. End Show 10-2 Cell Division Slide 16 of 38 Copyright Pearson Prentice Hall Mitosis Prophase Chromosomes coil. The centrioles separate and move to the poles. Chromosomes appear double stranded. Spindle forming Centromere Chromosomes (paired chromatids)

17. End Show 10-2 Cell Division Slide 17 of 38 Copyright Pearson Prentice Hall Mitosis Spindle fibers form a fanlike microtubule structure that helps separate the chromosomes. Spindle forming Centromere Chromosomes (paired chromatids)

18. End Show 10-2 Cell Division Slide 18 of 38 Copyright Pearson Prentice Hall Centriole Spindle Mitosis Click to Continue Metaphase

19. End Show 10-2 Cell Division Slide 19 of 38 Copyright Pearson Prentice Hall Mitosis Metaphase The chromosomes line up across the center of the cell. The centromere of each chromosome attaches to a spindle fiber. Centriole Spindle

20. End Show 10-2 Cell Division Slide 20 of 38 Copyright Pearson Prentice Hall Individual chromosomes Anaphase Mitosis Anaphase

21. End Show 10-2 Cell Division Slide 21 of 38 Copyright Pearson Prentice Hall Mitosis Anaphase The sister chromatids separate into individual chromosomes. The chromosomes move to opposite poles. Individual chromosomes

22. End Show 10-2 Cell Division Slide 22 of 38 Copyright Pearson Prentice Hall Nuclear envelope reforming Telophase Mitosis Telophase

23. End Show 10-2 Cell Division Slide 23 of 38 Copyright Pearson Prentice Hall Mitosis Telophase Chromosomes gather at opposite ends of the cell and uncoil. A new nuclear membrane forms around each cluster of chromosomes.

24. End Show 10-2 Cell Division Slide 24 of 38 Copyright Pearson Prentice Hall Cytokinesis

25. End Show 10-2 Cell Division Slide 25 of 38 Copyright Pearson Prentice Hall Cytokinesis During cytokinesis, the cytoplasm pinches in half. Each daughter cell has an identical set of duplicate chromosomes

26. End Show 10-2 Cell Division Slide 26 of 38 Copyright Pearson Prentice Hall Cytokinesis in Plants In plants, a structure known as the cell plate forms midway between the divided nuclei. Cell wall Cell plate

27. End Show Slide 27 of 38 Copyright Pearson Prentice Hall 10-2 The series of events that cells go through as they grow and divide is called a.the cell cycle. b.mitosis. c.interphase. d.cytokinesis.

28. End Show Slide 28 of 38 Copyright Pearson Prentice Hall 10-2 The phase of mitosis during which the chromosomes line up across the center of the cell is a.prophase. b.metaphase. c.anaphase. d.telophase.

29. End Show Slide 29 of 38 Copyright Pearson Prentice Hall 10-2 Cytokinesis usually occurs a.at the same time as telophase. b.after telophase. c.during interphase. d.during anaphase

30. End Show Slide 30 of 38 Copyright Pearson Prentice Hall 10-2 DNA replication takes place during the a.S phase of the cell cycle. b.G 1 phase of the cell cycle. c.G 2 phase of the cell cycle. d.M phase of the cell cycle.

31. End Show Slide 31 of 38 Copyright Pearson Prentice Hall 10-2 During mitosis, “sister” chromatids separate from one another during a.telophase. b.interphase. c.anaphase. d.metaphase.

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