A: The complete disintegration of the nuclear | vedclass

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(A) The complete disintegration of the nuclear envelope is the characteristic feature that marks the transition from prophase to metaphase.During meta

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The complete disintegration of the nuclear envelope is the characteristic feature that marks the transition from prophase to metaphase.During metaphase,the chromosomes are clearly visible under a microscope and consist of two sister chromatids held together at the centromere.Therefore,both the Assertion and the Reason are correct,and the Reason provides a correct description of the state of chromosomes during this phase.

$A$: The complete disintegration of the nuclear envelope marks the start of metaphase.
$R$: Chromosomes are distinct with two chromatids at this stage.

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$A$: The complete disintegration of the nuclear envelope marks the start of metaphase.$R$: Chromosomes are distinct with two chromatids at this stage.