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Metaphase is when the chromosomes attach to the spindle fibers by their centromeres. This can be confused with the phases:prophase where the spindle fibers form a bridge between the ends of the cell, and anaphase where the spindle fibers draw the chromosomes to the opposite ends of the cell(the cell splits up) Report.
Definition: Spindle fibers are aggregates of microtubules that move chromosomes during cell division. During prophase of mitosis, spindle fibers form at opposite poles of the cell. During metaphase, spindle fibers extend from the cell poles toward the midpoint of the cell known as the metaphase plate. Chromosomes are held at the metaphase plate by the equal forces of the spindle fibers pushing on the centromeres of the chromosomes. In anaphase, spindle fibers pull sister chromatids toward the spindle poles. Spindle fibers not connected to chromatids lengthen and elongate the cell.