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Wednesday: March 10, 2010

Wednesday: March 10, 2010. Have a seat, clear your desk, take out a writing utensil…. OBJECTIVES: What happens during each phase of mitosis. What does the cell look like during each stage of mitosis . DUE: Section 9.1 assessment questions HOMEWORK:

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Wednesday: March 10, 2010

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  1. Wednesday: March 10, 2010 Have a seat, clear your desk, take out a writing utensil… OBJECTIVES: What happens during each phase of mitosis. What does the cell look like during each stage of mitosis. DUE: Section 9.1 assessment questions HOMEWORK: Read section 9.2 and answer assessment questions #1-5 on p. 252 Complete cell cycle worksheet as well.

  2. CellCycle Interphase Mitosis Cytokinesis Prophase Telophase G1 G2 S-Synthesis Metaphase Anaphase • EUKARYOTICcells reproduce by: • mitosis: the process of nuclear division • and • cytokinesis: the process of cytoplasm division • PROKARYOTIC cells reproduce by a method called binary fission.

  3. Closer Look at Chromosomes… CHROMATIN DNA SISTER CHROMATID CHROMOSOME CENTROMERE

  4. PROPHASE • Nuclear membrane disintegrates • Nucleolus disappears • Chromatin (relaxed form of DNA) condenses into chromosomes • Chromosomes in prophase are actually sister chromatids that are attached at the centromere. • Centrioles migrate to pole ends of the cell and microtubules form.

  5. METAPHASE • Chromosomes attach to mitotic spindle and align along equator of cell

  6. ANAPHASE • Microtubules shorten, moving chromosomes to opposite poles.

  7. TELOPHASE • Sister chromatids reach poles of cell • Nuclear envelope re-develops • Chromosomes decondense

  8. CYTOKINESIS • In animal cells, cleavage furrow forms at equator of cell and pinches inwards until cell divides in two. • In plants, a cell plate forms dividing daughter cells into two

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