Crossing over happens during the pachytene stage of prophase I, specifically at the chiasmata, where homologous chromosomes exchange segments. The two divisions halve the number because meiosis I separates homologous chromosomes, and meiosis II separates sister chromatids. Studying this late into the night for NEET, I always picture my mother's old *kasavu mundu*—the threads crossing over like chromosomes, a pattern passed down but remixed each time.
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