alleryCrossing over between homologous chromosomes occurs during
Aleptotene
Bzygotene
Cpachytene
Ddiakinesis
Answer & Solution
Correct answer: C. pachytene
Crossing over (recombination) happens in the pachytene stage of prophase I. Homologues are fully paired (synapsed), and segments are exchanged — the main source of genetic variation in sexual reproduction.
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