Heritability of a linear combination of traits
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The heritability, hI2, of a linear combination of phenotypes, I, when defined as the ratio of the variance of the genetic index, σg⋆2*, to the variance of the index, σI2, is shown to be different from the square of the correlation, rHI2, between the index and an arbitrary linear combination of genetic effects, H. The gain in H fror selection on I is shown to be proportional to hI2. bHg⋆ for any index.
Key wordsSelection Index Heritability
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