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During prophase, the nucleus disappears, spindle fibers form, and DNA condenses into chromosomes (sister chromatids). During metaphase, the sister chromatids align along the equator of the cell by attaching their centromeres to the spindle fibers. During anaphase, sister chromatids are separated at the centromere and are pulled towards opposite poles of the cell by the mitotic spindle. During telophase, chromosomes arrive at opposite poles and unwind into thin strands of DNA, the spindle fibers disappear, and the nuclear membrane reappears.
The correct answer is anaphase ll. During this phase the kinetichore fibers, attach to the centromeres of the chromosomes, while they are lined up on the metaphase plate. These special fibers then split apart the chromosome and bring them to opposite parts of the cell. The cell then splits apart as a reslt of cytokinesis.