HardBotany
+4 / -1
Crossing over (genetic recombination) occurs during which sub-stage of Meiosis I?
A
Pachytene
B
Leptotene
C
Zygotene
D
Diplotene
Explanation
Crossing over occurs at the Pachytene stage when bivalents (tetrads) are fully formed. The actual cross-shaped structures (chiasmata) become visible at Diplotene. Leptotene: chromosomes condense; Zygotene: synapsis (synaptonemal complex forms); Pachytene: crossing over; Diplotene: chiasmata visible.
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