In meiosis crossing over is initiated at

5 2016 Cell Cycle and Cell DivisionMeiosis – Prophase I Easy
In meiosis crossing over is initiated at
A leptotene.
B zygotene.
C diplotene.
D pachytene.

Explanation

Crossing over occurs at pachytene.

Detailed Solution

Prophase I of meiosis has five phases: leptotene, zygotene, pachytene, diplotene and diakinesis. Crossing over takes place during pachytene.
Note: the source answer key prints (c) diplotene, but its own explanation (and the biology) gives pachytene, which is keyed here.

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