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Topic #78 and #79 Class Notes: Cell Cycle

Topic #78 and #79 Class Notes: Cell Cycle. Cell Division. Most body cells divide to increase their number through a process of mitosis, which results in two daughter cells with identical sets of chromosomes. The cell starts with 46 chromosomes and ends with the same number of chromosomes.

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Topic #78 and #79 Class Notes: Cell Cycle

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  1. Topic#78 and #79 Class Notes: Cell Cycle

  2. Cell Division • Most body cells divide to increase their number through a process of mitosis, which results in two daughter cells with identical sets of chromosomes. • The cell starts with 46 chromosomes and ends with the same number of chromosomes. • A chromosome is a structure made of DNA and protein in the nucleus of a eukaryotic cell.

  3. The Cell Cycle • Has three stages: • -interphase • - mitosis • -cytokinesis

  4. 1st stage: Interphase • Longest stage in the cell cycle • cell grows and develops • Toward the end, DNA doubles (chromosomes, double) • Also called G1, S, G2

  5. 2nd stage Mitosis • The second stage of the cell cycle has four phases • -prophase • -metaphase • -anaphase • -telophase Also called M phase

  6. More details • Prophase -chromosomes are visible -nuclear membrane disappears -nucleolus disappears

  7. Metaphase • - chromosomes line upacross center • -spindle fibers attach to center of chromosomes

  8. Anaphase • -chromosomes split • - each half is pulled to opposite side of the cell.

  9. Telophase • Chromosomes cluster in the center of each new cell. • Nuclear membrane begins to form • Cells begin to separate • End of mitosis

  10. 3rd stage Cytokinesis • Last stage of cell division • -cytoplasm divides • -two daughter cells form • -same number of chromosomes as parent cell. Also called C phase

  11. Mnemonic Device • A mnemonic device is helpful for memorizing the cell cycle and steps of mitosis. • Example: IPMATC • Interphase, prophase, metaphase, anaphase telophase and cytokinesis I play music at the concert • Now its your turn to make your own mnemonic device.

  12. #82 Flip Book -Cell Cycle • Read Chapter Project • on page 168 from textbook • Due 11/2 • Rubric • -10 pages or more –first drawing on the last page (depends on the class • Keep the figure as close as possible to the edge of the page • Trace or redraw most of the images, changing a small part of it only slightly. • Start with interphase and end with cytokinesis • Include 4 pairs chromosomes • color code

  13. Movie clips • http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter10/animation_-_cell_division.html • http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter10/how_the_cell_cycle_works.html • http://www.cellsalive.com/mitosis.htm • After watching the movie clips: Discuss Movie Clip.

  14. Complete #80 and #81 Handout . • Please work in pairs. • #80 Handout: Mitosis and Cell Cycle • Use your textbook section 8.1 • #81Handout: Phases of Mitosis • Use the microscope in the back of the classroom

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