Question Detail
Question
During which stage of prophase I does the crossing over take place
Correct Answer
Option B is the correct answer.
Detailed Explanation
Crossing over, the exchange of genetic material between non-sister chromatids, occurs during the pachytene stage of prophase I. In zygotene, chromosomes pair; in pachytene, crossing over happens; in diplotene, chiasmata become visible.
Hint
In which substage of prophase I are chromosomes tightly paired and crossing over occurs?