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Unformatted text preview: heritability to mean the proportion of the total phenotypic variance that is due to additive genetic effects: h 2 N = V A /V P where h 2 N means heritability in the "narrow" sense. Returning to our regression of offspring values vs. parent values (see figure 9.4 page 227), the slope of this regression = h 2 N = V A /V P ( known as a midparentoffspring regression). This allows us to define what kind of response to selection we would get if we imposed a specific intensity of selection on a phenotypic trait. The selection differential (S) is the difference between the mean of the parents selected to produce the next generation and the mean of all individuals in the population. The response to selection (R) is the change in the mean phenotype after selection. The response to selection depends of the heritability of the trait: R = h 2 N S (see figure 9.6 pg. 237)....
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This note was uploaded on 11/05/2011 for the course BIOLOGY MCB2010 taught by Professor Jessicadigirolamo during the Fall '10 term at Broward College.
 Fall '10
 JessicaDigirolamo
 Microbiology

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