Define linkage and crossing over
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Crossing over: It is the exchange of segments between non-sister chromatids of homologous chromosomes. It occurs during pachytene stage of prophase I in meiosis. Crossing over always occurs between linked genes. It produces recombination of linked genes which play very important role in evolution.
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Define linkage:
The tendency of two or more genes present on the same chromosomes to be inherited together is known as linkage.
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