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In anaphase, the paired chromosomes (sister chromatids) separate and begin moving to opposite ends (poles) of the cell. Spindle fibers not connected to chromatids lengthen and elongate the cell.
Once the paired sister chromatids separate from one another, each is considered a full chromosome. They are referred to as daughter chromosomes.
In preparation for the next stage of mitosis, telophase, the two cell poles also move further apart during the course of anaphase. At the end of anaphase, each pole contains a complete compilation of chromosomes.
Learn more about mitosis: