A

Chromosomes pair ■

Synaptonemal complex

-Chiasmata

Chromosomes pair ■

Synaptonemal complex

-Chiasmata

2.16 Crossing over takes place in prophase I. In yeast, rough pairing of chromosomes begins in leptotene and continues in zygotene. The synaptonemal complex forms in pachytene. Crossing over is initiated in zygotene, before the synaptonemal complex develops, and is not completed until near the end of prophase I.

Table 2.2 Major events in each stage of meiosis

Stage

Major Events

Meiosis I

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