Ah, they teach you it's all about prophase I, but in our live imaging, the real commitment happens at metaphase I—when those homologous pairs stubbornly line up, that's the irreversible crossroad. The first division separates homologs, the second separates sisters, and that's how you get from diploid to haploid. In my lab, we see it in the durian flower buds under the scope; their messy, beautiful bivalents tell the true story, not the textbook diagram.
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