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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After $Meiosis-I$,the two sister chromatids of a chromosome are:

If $N = 16$ in a plant cell,how is it represented in Metaphase-$I$ of meiosis?

Assertion : Diplotene is characterized by the presence of chiasmata.
Reason : Diplotene can last for months and years in oocytes of some vertebrates.

$S -$ Statement: In the pachytene substage,each group of chromosomes appears as a bivalent.
$R -$ Reason: During prophase in plant cells,the centriole units arranged at the two poles form spindle fibers.

The four daughter cells derived from a single meiosis differ from each other due to

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