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| Modern Genetic Analysis Chapter 18. Quantitative Genetics The Heritability of a Trait Figure 18-8. Standard method for testing heritability in experimental organisms. Crosses are performed within two populations of individuals selected from the extremes of the phenotypic distribution in the parental generation. If the phenotypic distributions of the two groups of offspring are significantly different from each other, then the trait is heritable. If both offspring distributions resemble the distribution for the parental generation, then the trait is not heritable.

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