Assertion :Synthesis of DNA takes place in the S phase of interphase. Reason: Every chromosome, during metaphase, has two chromatids.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
A typical cell cycle comprises of interphase and mitotic phase (M-phase). The interphase comprises of first growth phase or G $_{1}$ phase, synthesis phase or S phase and second growth phase or G $_{2}$ phase. The DNA synthesis occurs during S phase in the process of DNA replication. In the mitotic phase, each chromosome has two sister chromatids. The two sister chromatids are clearly visible during metaphase stage because the chromosomes are highly coiled. The two sister chromatids are joined at the centromere.
So, the correct answer is option B.

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