does crossing-over process occur in binary fission?
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Crossing-over never takes place in binary fission.
Crossing-over exclusively takes place during meiosis at pachytene subphase of Prophase -1 when exchange of gene takes place among the homologous chromosomes.
But binary fission is a mode of asexual reproduction that mean it involves only one parent so formation of homologous chromosomes never takes place.Thus crossing over never occurs in binary fission.
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