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| Modern Genetic Analysis Chapter 18. Quantitative Genetics Covariance and correlation. Figure 18-15. Scatter diagrams of relations between pairs of variables. (a) Relation between the lengths of the first and second lower molars (M1 and M2) in the extinct mammal Phenacodus primaevis. Each point gives the M1 and M2 measurements for one individual. (b) Tail length and body length of 18 individuals of the snake Lampropeltis polyzona. (Image: Negative #2430, Phenacodus, painting by Charles Knight; courtesy Dept. of Library Services, American Museum of Natural History. Photo: Animals Animals/© Zig Leszczynski)

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