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

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Presentation on theme: "End Show Slide 1 of 38 Copyright Pearson Prentice Hall 10-2 Cell Division."— Presentation transcript:

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 Sister chromatids Centromere Chromosomes Each chromosome consists of two identical sister chromatids. Each pair of chromatids is attached at an area called the centromere. Video of this

3 End Show 10-2 Cell Division Slide 3 of 38 Copyright Pearson Prentice Hall The Cell Cycle The cell cycle consists of four phases: G 1 (First Gap Phase) S Phase G 2 (Second Gap Phase) M Phase (cell division) Mitosis (Prophase, Metaphase, Anaphase, Telophase) Cytokinesis INTERPHASE

4 End Show 10-2 Cell Division Slide 4 of 38 Copyright Pearson Prentice Hall Cell Cycle Events of the Cell Cycle

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 and organelles During the S phase, chromosomes are replicated DNA synthesis takes place Once a cell enters the S phase, it usually completes the rest of the cell cycle. The G 2 Phase (Second Gap Phase) organelles and molecules required for cell division are produced Once G 2 is complete, the cell is ready to start the M phaseMitosis

6 End Show 10-2 Cell Division Slide 6 of 38 Copyright Pearson Prentice Hall Mitosis Biologists divide the events of mitosis into four phases: Prophase Metaphase Anaphase Telophase

7 End Show 10-2 Cell Division Slide 7 of 38 Copyright Pearson Prentice Hall Movie Time & LAB TIME!!!!

8 End Show 10-2 Cell Division Slide 8 of 38 Copyright Pearson Prentice Hall Mitosis

9 End Show 10-2 Cell Division Slide 9 of 38 Copyright Pearson Prentice Hall Section 10-2 Prophase Spindle forming Chromosomes (paired chromatids) Centromere Click to Continue Mitosis Prophase

10 End Show 10-2 Cell Division Slide 10 of 38 Copyright Pearson Prentice Hall Mitosis Prophase Prophase is the first and longest phase of mitosis. The centrioles separate and take up positions on opposite sides of the nucleus. Spindle forming Centromere Chromosomes (paired chromatids)

11 End Show 10-2 Cell Division Slide 11 of 38 Copyright Pearson Prentice Hall Mitosis The centrioles lie in a region called the centrosome. The centrosome helps to organize the spindle, a fanlike microtubule structure that helps separate the chromosomes. Spindle forming Centromere Chromosomes (paired chromatids)

12 End Show 10-2 Cell Division Slide 12 of 38 Copyright Pearson Prentice Hall Mitosis Chromatin condenses into chromosomes. The centrioles separate and a spindle begins to form. The nuclear envelope breaks down. Spindle forming Centromere Chromosomes (paired chromatids)

13 End Show 10-2 Cell Division Slide 13 of 38 Copyright Pearson Prentice Hall Centriole Spindle Mitosis Click to Continue Metaphase

14 End Show 10-2 Cell Division Slide 14 of 38 Copyright Pearson Prentice Hall Mitosis Metaphase The second phase of mitosis is metaphase. The chromosomes line up across the center of the cell. Microtubules connect the centromere of each chromosome to the poles of the spindle. Centriole Spindle

15 End Show 10-2 Cell Division Slide 15 of 38 Copyright Pearson Prentice Hall Individual chromosomes Anaphase Mitosis Anaphase

16 End Show 10-2 Cell Division Slide 16 of 38 Copyright Pearson Prentice Hall Mitosis Anaphase Anaphase is the third phase of mitosis. The sister chromatids separate into individual chromosomes. The chromosomes continue to move until they have separated into two groups. Individual chromosomes

17 End Show 10-2 Cell Division Slide 17 of 38 Copyright Pearson Prentice Hall Nuclear envelope reforming Telophase Mitosis Telophase

18 End Show 10-2 Cell Division Slide 18 of 38 Copyright Pearson Prentice Hall Mitosis Telophase Telophase is the fourth and final phase of mitosis. Chromosomes gather at opposite ends of the cell and lose their distinct shape.

19 End Show 10-2 Cell Division Slide 19 of 38 Copyright Pearson Prentice Hall Mitosis A new nuclear envelope forms around each cluster of chromosomes.

20 End Show 10-2 Cell Division Slide 20 of 38 Copyright Pearson Prentice Hall Cytokinesis

21 End Show 10-2 Cell Division Slide 21 of 38 Copyright Pearson Prentice Hall Cytokinesis During cytokinesis, the cytoplasm pinches in half. Each daughter cell has an identical set of duplicate chromosomes

22 End Show 10-2 Cell Division Slide 22 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

23 End Show 10-2 Cell Division Slide 23 of 38 Copyright Pearson Prentice Hall Cytokinesis in Plants The cell plate gradually develops into a separating membrane. A cell wall then begins to appear in the cell plate.


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