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| Modern Genetic Analysis Chapter 2. The Structure of Genes and Genomes The Nature of Eukaryotic Nuclear Chromosomes Figure 2-20. Drawings of chromosomes of a protozoan, demonstrating coiling and supercoiling visible with the light microscope. Two large chromosomes are shown: one orange and the other yellow; the chromosomes are duplicated because sexual cell division is about to occur. (From L. R. Cleveland, "The Whole Life Cycle of Chromosomes and Their Coiling Systems," Trans. Am. Philosophical Soc. 39, 1949, 1.)

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