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Unformatted text preview: centrosome . During interphase, the cell has one centrosome but just before prophase, the centrosome duplicates, producing a second centrosome. During prophase, microtubules radiate from each centrosome. Some of the microtubules extend from one centrosome toward the other. The entire complex of centrosomes and spindle fibers is called the spindle apparatus. Each centrosome of an animal cell contains two centrioles . Plant cells do not have centrioles but they do form spindle fibers. Kinetochores and Kinetochore Microtubules During prophase, protein plates called kinetochores form on the centromeres of each chromosome. Kinetochore microtubules are spindle fibers that attach to the kinetochores and move the chromosomes to the center of the cell. The next phase (Metaphase) begins when the chromosomes become aligned in the center of the cell....
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