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Question

Assertion :The crossing over is an enzyme-mediated process. Reason: The enzyme involved in crossing over is lyase.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
Crossing over or recombination occurs during pachytene. Recombination involves mutual exchange of the corresponding segments of non-sister chromatids of homologous chromosomes. It takes place by breakage and reunion of chromatid segments. Breakage, called nicking, is assisted by an enzyme endonuclease and reunion, termed annealing, is aided by an enzyme ligase. Crossing over leads to recombination of genetic material on the two chromosomes. So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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