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Progression of meiosis in bimD6 and wild-type asci. All nuclei are stained with DAPI. (A) Early bimD6 prophase. (B) Early wild-type prophase. (C) bimD6 pachytene. (D) Wild-type pachytene; arrow indicates the nucleolar organizer bivalent. (E) Spread metaphase I nucleus of bimD6. Note the small size of some of the chromatin units (arrow) when compared with normal bivalents (four seen, Left). (F) Wild-type metaphase I (four clearly separated and four overlapping bivalents). (Bar = 5 μm.)
