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Solution


Q.

Crossing over takes place between which chromatids and in which stage of the cell cycle    [2019]
1 Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I.  
2 Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.  
3 Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I.  
4 Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I.  

Ans.

(2)