The phase of the cell cycle during which pairs of chromosomes are segregated by the retraction of spindle fibers is Anaphase.
The anaphase stage of cell cycle can be seen in mitosis as well as meiosis. During this phase, the chromosome pairs split and begin to move away from each other, towards the opposite poles of the cell. The Anaphase stage is marked by certain important events such as the splitting of centromeres as well as the segregation of chromatids.
Anaphase takes place after the Metaphase stage of cell division. The chromosomes which are aligned along the metaphase plate by means of spindle fibers to both poles of the cell during Metaphase are separated during Anaphase.
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