lec_6_cond_13

Phenotype of their family offspring is another way to

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phenotype of their family (offspring) is another way to estimate h 2 Selection Response to selection Selection & Response Average phenotype of offspring Average phenotype of parents each data point represents a family the slope estimates heritability
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We need a Prediction equation for future selection Response to selection = heritability X Selection Differential = h X S R relative number 0 900 average = 404 G=0 G=1 Parents 0 0 900 seed size (mg) Offspring S R=? 2 suppose that we selected the top 2% R = h x S = 0.71 x 400 = 284 284 mg. of improvement in one generation Letting h 2 = .71 and S = 400, 2 so expect: Examples of heritability in humans Trait heritability (h 2 ) Finger prints (# ridges) 0.98 head width 0.90 body weight 0.05 why the difference between head with and weight? Suppose that we used a new selection differential (S) So in summary, the degree of the response to selection (R) depends on the heritability (h 2 ) relative number 0 900 average = 404 692 G=0 G=1 Parents 0 0 900 seed size (mg) average = 692 Offspring R S Maximal response R = S (h 2 = 1) Minimal response R = 0 (h 2 = 0) relative number 0 900 average = 404 692 G=0 G=1 Parents 0 0 900 seed size (mg) average = 404 Offspring R=0 S Exactly intermediate response (h 2 = 0.5) relative number 0 900 average = 404 692 G=0 G=1 Parents 0 0 900 seed size (mg) average = 548 Offspring R = S/2 For example, if h 2 = .71 and S = 804-404= 400 our estimate from the previous experiment mean of top 2% mean of population 29
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