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Meiosis in DAPI-stained pollen mother cells of B. holboellii apomicts. The Het chromosome (star) is often clearly heteropycnotic and can form a heteromorphic bivalent. The Del chromosome (diamond) is much shorter than the other chromosomes and can associate with two other chromosomes to form a heteromorphic trivalent. (a–c) BH1 at metaphase I. (d and e) BH74 at asynaptic pachytene (d) and metaphase I (e). (f) BH115 at metaphase I.
