Assertion :Events in pachytene play a key role in evolutionary changes in organisms. Reason: Exchange of genetic material takes place between sister chromatids of homologous chromosomes.

Assertion and reason is true, reason is correct explanation of assertion

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Assertion and reason is true, reason is not the correct explanation of assertion

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Assertion is true reason is false

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Assertion is false reason is true

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Solution

The correct option is C Assertion is true reason is false
Crossing over is the process of the exchange of genetic material between non-sister chromatids of homologous chromosomes to produce new genetic combinations or variations.
It occurs during pachytene of prophase I of meiosis I. These variations serve as raw material for evolution as natural selection acts upon them to produce new species.
Therefore, the correct answer is option C.

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