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Standard XII
Biology
Question

Assertion :The lampbrush chromosomes are called diplotene chromosomes bivalents.
Reason: The number of loops is maximum during diplotene.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  3. Assertion is correct but Reason is incorrect
  4. Both Assertion and Reason are incorrect

A
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
B
Both Assertion and Reason are incorrect
C
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
D
Assertion is correct but Reason is incorrect
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Solution
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The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The lampbrush chromosomes are highly elongated special kind of synapsed mid-prophase or diplotene chromosome bivalents which have already undergone crossing over. They occur in diplotene stage of most animal occystes, spermatocytes of many and even giant nucleus of unicellular alga Acetabularia. The number of pairs of loops gradually increase in meiosis till it reaches maximum is diplotene.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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