Biology
Grade-9
Easy
Question
Crossing over happens during:
- Mitosis
- Meiosis I
- Meiosis II
- Anaphase I
Hint:
Crossing over occurs during Prophase I.
The correct answer is: Meiosis I
During prophase I of meiosis the chromosomes coil up, the nuclear membrane begins to disintegrate, and the centrosomes begin moving apart. The two chromosomes may exchange fragments by a process called crossing over.
Hence, crossing over occurs during Meiosis I.
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