NEET Biology question

Assertion: Polytene chromosomes have a high amount of DNA. Reason: Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of chromatids.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Both statements are true: polytene ("giant") chromosomes, first observed by Balbiani in the salivary glands of *Chironomus*, do contain an exceptionally high amount of DNA because they form through repeated rounds of chromosomal DNA replication

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Question ID VK-119718