The Mitotic Chromosomes of the Cellular Slime Mould Dictyostelium discoideum: A Karyotype Based on Giemsa Banding

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Abstract
All 7 mitotic chromosomes of the haploid cellular slime mold D. discoideum were identified and numbered using Giemsa banding techniques. Although size differences are not marked, the size distribution is 1 long, 3 medium length and 3 shorter chromosomes. Each chromosome has a distinctive banding pattern. All 7 chromosomes appear to have terminal or near terminal centromeres. Apparent connections between chromosomes explain the controversy concerning chromosome number (5 or 7) in D. discoideum. The mitotic index of exponential-phase axenic cultures of D. discoideum is 2%. By returning aggregating amoebae to growth medium the mitotic index could be reproducibly raised to approximately 6%.

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