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Consider a continuous phenotypic trait with an initial average value of 5. In the next generation, the average value of the t

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  • The narrow-sense heritability - the fraction of phenotypic variance due to additive genetic values (Breeding values)
  • h2 = VA/VP = 0.5 where, h2 = narrow-sense heritability; VP = Phenotypic variance; VA = Additive genetic variance
  • The selection differential - within-generation change in the mean or difference between the mean of selected parents and the population mean before selection
  • S = µ* - µ = 7 - 5 = 2
  • The Response to Selection - the change in mean over one generation
  • As per The Breeders’ Equation, R = h2 S = 0.5 * 2 = 1
  • The realized heritability - If R and S are known, then h2 can be estimated as the ratio R/S = 1/2 = 0.5
  • The selection differential is 2
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