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| Modern Genetic Analysis Chapter 18. Quantitative Genetics Measures of Central Tendency Figure 18-13. Asymmetric distribution functions. (a) Asymmetric distribution of seed weight in Crinum longifolium. (b) Bimodal distribution of survival of Drosophila willistoni expressed as a percentage of standard survival. (Adapted from S. Wright, Evolution and the Genetics of Populations, Vol. 1. Copyright © 1968 by University of Chicago Press, 1968.) (Photo: Earth Scenes/© Thompson GOSF)

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