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| Modern Genetic Analysis Chapter 6. Gene Interaction Penetrance and Expressivity Figure 6-20. Variable expressivity shown by 10 grades of piebald spotting in beagles. Each of these dogs has SP, the allele responsible for piebald spots in dogs. (Adapted from Clarence C. Little, The Inheritance of Coat Color in Dogs, Cornell University Press, 1957, and from Giorgio Schreiber, Journal of Heredity 9, 1930, 403.)

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