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Unformatted text preview: Mitosis The act of mitosis can be conveniently divided into four phases. prophase The replicated chromosomes become visible and can be seen to be comprised of two sister chromatids still joined together at the centromere , the nuclear membrane breaks down, centrioles move to opposite poles and the spindle forms between them. metaphase The chromosomes attach to the spindle by their kinetochores (which are part of the centromere structure). The chromosomes are now at their most condensed. They line up at the equator of the spindle. anaphase The centromeres divide the chromosomes are pulled apart to the two poles by contracting spindle fibres. telophase Nuclear membranes reform the chromosomes decondense. The daughter cells return to interphase....
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- Fall '10