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| Modern Genetic Analysis Chapter 2. The Structure of Genes and Genomes The Nature of Eukaryotic Nuclear Chromosomes Figure 2-15. Polytene chromosomes form a chromocenter in a Drosophila salivary gland. (a) Mitotic metaphase chromosomes, with arms represented by different shades. (b) Hetero-chromatin coalesces to form the chromocenter. (c) Photograph of poly-tene chromosomes. (Tom Kaufman.)

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