Toxin levels were measured in milkweed plants from a large cornfield in Iowa and

Question

Toxin levels were measured in milkweed plants from a large cornfield in Iowa and found to have a mean level of 28.2 mg per gram and a variance of 15 3 Seeds were collected from these plants and germinated in a single, large greenhouse allowing all plants to germinate and grow under identical environmental conditions At maturity, toxin levels were assessed across all of these plants The mean toxin level was 33 2 mg per gram with a variance of 8.70 What is the estimated broad-sense heritability for this trait in this cornfield population of milkweed? Remember that H^2 = broad-sense heritability = V_G/V_P

Explanation / Answer

H2 = Vg/Vp and that Vp = Vg + Ve

Vg is due to genotypic variance, Vp is phenotypic variance and Ve is environmental variance

H2= 8.7/ 15.3 = 0.56

Vp is equal to genotypic variance since there is no environmental variance

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