X- It is very important for the process of ev | vedclass

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(B) Crossing over is a process that occurs during prophase-$I$ of meiosis,where homologous chromosomes exchange genetic material.This process leads to

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Both are true for meiosis.

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(B) Crossing over is a process that occurs during prophase-$I$ of meiosis,where homologous chromosomes exchange genetic material.This process leads to genetic recombination,which introduces variation in offspring.Genetic variation is a fundamental requirement for the process of evolution.Therefore,both statements $X$ and $Y$ describe processes or characteristics associated with meiosis.

$X-$ It is very important for the process of evolution.
$Y-$ Crossing over is the exchange of genetic material between two homologous chromosomes.

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$X-$ It is very important for the process of evolution.$Y-$ Crossing over is the exchange of genetic material between two homologous chromosomes.