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  4. At which stage of meiosis-I does crossing over occur?

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Q. At which stage of meiosis-I does crossing over occur?

KVPYKVPY 2011

Solution:

During pachytene stage of meiosis-I, a tetrad of the chromosomes form known as a bivalent. This is the stage when homologous recombination, including chromosomal crossover (crossing over) occurs.