The spindle fibre contracts in

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(B) During cell division,the contraction of spindle fibres occurs during the Anaphase stage of both mitosis and meiosis ($Anaphase \ I$ and $Anaphase

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Anaphase $II$

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(B) During cell division,the contraction of spindle fibres occurs during the Anaphase stage of both mitosis and meiosis ($Anaphase \ I$ and $Anaphase \ II$).This contraction pulls the sister chromatids (in $Anaphase \ II$) or homologous chromosomes (in $Anaphase \ I$) towards the opposite poles of the cell.Among the given options,$Anaphase \ II$ is the stage where spindle fibre contraction leads to the separation of sister chromatids.

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