Assertion :Crossing over leads to recombination of genetic material on the two chromosomes. Reason: Crossing over is the exchange of genetic material between two homologous chromosomes.
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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.