A) pachytene
B) zygotene
C) leptotene
D) diakinesis
Correct Answer: A
Solution :
During pachytene stage, crossing over takes place. It is an exchange of equal segments of non-sister chromatids belonging to two different but homologous chromosomes. The chromosome pair (ie, bivalent) consists of four chromatids and thus crossing over takes place at four stranded stage.
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