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It is possible to estimate the heritability for a trait in a population if phenotypes and genetic relationships (pedigree) is available. A h2 of 0.3 indicates that 30% of the variation you observe in your phenotypes is due to additive genetic differences between the animals. If ALL phenotypic differences are due to genetic differences, then the h2 will be 1.0. Larger than 1.0 by definition is not possible. Similarly, if the differences between animals are NOT determined by their genetics, then the h2 = 0.0. Smaller than 0.0 by definition is not possible.
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