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| Modern Genetic Analysis Chapter 17. Population and Evolutionary Genetics Artificial Selection Figure 17-14. Changes in average bristle number obtained in two laboratory populations of Drosophila melanogaster through artificial selection for high bristle number in one population and for low bristle number in the other. The dashed segment in the curve for the upwardly selected line indicates a period of five generations in which no selections were performed. (From K. Mather and B. J. Harrison, "The Manifold Effects of Selection," Heredity 3, 1949, 1.)

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