phases_of_mitosis - Web Animation The Phases of Mitosis...

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Web Animation The Phases of Mitosis After reading the text, you should be able t o... Describe the main events that occur immediately before and after mitosis. Explain briefly where M phase fits into the cell cycle. Name the major cell structures involved in mitosis. After viewing this animation , you should be able t o... Name the phases of mitosis. Specify the main events that occur in each phase. NARRATION The Phases of Mitosis This cell is ready to enter the M phase of the cell cycle. Chromosomes have already been duplicated; each consists of two identical sister chromatids joined at a region called the centromere. Outside the nucleus, the cell’s centrioles have also been duplicated during interphase. The pairs of centrioles lie within centrosomes, which serve as organizing cen- ters for an array of microtubules. As the cell enters prophase, the first stage of mitosis, two mitotic spindles —assemblies of microtubules—form from each centrosome. The chromosomes condense into compact structures that can be seen with a light microscope. During prometaphase, the second stage of mitosis, the nuclear envelope breaks down. After the nuclear envelope has disintegrated, spindle fibers from each mitotic spindle attach to one of the two sister chromatids of each chromosome. The point of attachment is
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This note was uploaded on 12/11/2011 for the course BIO 152 taught by Professor Cordon during the Spring '07 term at University of Toronto- Toronto.

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phases_of_mitosis - Web Animation The Phases of Mitosis...

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