Assertion :Prophase is the first stage of mitosis which follows S and $G_{1}$ phases of interphase. Reason: Prophase is marked by the initiation of clusters of chromosomes.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Prophase which is the first stage of mitosis follows the S and $G_{2}$ phases of interphase. In the S and $G_{2}$ phases the new DNA molecules formed are not distinct but interwined. Prophase is marked by the initiation of condensation of chromosomal material. The chromosomal material becomes untangled during the process of chromatin condensation.

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