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Examples of regular disjunction (A, C, E, and G) and nondisjunction (B, D, F, and H) of chromosome pairs 2, 4, and 5 in meiosis II cells. (A and B) spo11-1-3. (C and D) dsy1. (E and F) mpa1. (G and H) asy1. Individual chromosomes bearing 45S and 5S rDNA sequences are identified. (D) Telophase I. (A) Prophase II. (B, C, E, F, and H) Metaphase II. (G) Anaphase II. Bars, 10 μm.
