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| Modern Genetic Analysis Chapter 17. Population and Evolutionary Genetics Artificial Selection Figure 17-15. Changes in average egg production in a chicken population selected for its increase in egg-laying rate over a period of 30 years. (From I. M. Lerner and W. J. Libby, Heredity, Evolution, and Society, 2d ed. Copyright © 1976 by W. H. Freeman and Company. Data courtesy of D. C. Lowry.)

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