A) leptotene
B) diplotene
C) pachytene
D) zygotene
Correct Answer: C
Solution :
Crossing over occurs during pachytene or thick thread or pachynema substage of prophase-1 of meiosis. During this stage, an exchange of portions of chromatids between homologous chromosomes occur. At chiasma, the chromatids break and rejoin in such a way that sections are exchanged.
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