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Explanation of the term crossing over

Give a brief explanation of the term crossing over. And also write down the name of period of meiosis in which this event takes place?

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Crossing over is final and eventual exchange of the chromosomal fragments between the homologous chromosomes. The phenomenon takes place in the prophase I if homologous chromosomes are paired out.

Crossing over is of huge significance for the evolution as well as for biodiversity because it provides or offers recombination of the alleles (of dissimilar genes) associated in same chromosome throughout cell divisor by the meiosis.

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