Two non sister chromatid of a paired chromosome are attached at ___________during crossing over.
Fill the blank

Dear Student, 
When a chromosome is replicated in S phase the sister chromatids are formed or it is defined as either of the two chromatids joined by a common centromere.
Non-sister chromatids refers to the either of the chromatids of the homologous chromosomes.
Hence, Two non sister chromatids are attached at the CENTROMERE during crossing over.
Regards
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After attached comes

*Each to other*

Sorry I forget to type it......
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