Assertion :Polytene chromosomes have a high amount of DNA. Reason: Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Polytene chromosomes are giant chromosomes found in the salivary gland of Chironomus and Drosophila. Polytene chromosomes are formed by somatic pairing of homologous chromosomes followed by their repeated replication and there is no separation of the chromatids. There is high amount of DNA in these chromosomes due to multiple divisional copies.
Thus, the correct answer is option A.

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