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the total variance of 180-day body weight in a population of swine is 250 pounds. the variance due to dominance effects is 50 pounds. the variance due to epistatic effects is 20 pounds. The environmental variance is 350 pounds. what is the heritability estimate of this trait?

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Sixta Kovacek
Sixta KovacekLv2
17 Dec 2019
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Related questions

a. How do you estimate the variance (s2 ) of a behavioral trait in a population? b. What is the definition of heritability (strict/statistical)? c. What is one way to estimate heritability? d. How do you estimate the influence of “environment” on the variance of a trait in a population?

Hey guys! I'm a little stuck with this question, with calculating the total genetic variance I'm not sure whether my answers are correct.

(VG = VA + VD = VI

(Broad sense heritability) H2 = VG/VP

(Narrow Sense heritability) h2 = VA/VP

(Response to Selection) R = h2 x s

A plant breeder has determined the following variances for yield of corn:

Total phenotypic variance 100

Additive genetic variance 30

Dominance genetic variance 50

Environmental variance 20

Assume that there is no genetic-environmental interaction or other variances. a) Calculate the total genetic variance.

b) Calculate the broad-sense heritability indicated by these results.

c) Calculate the narrow-sense heritability indicated by these results.

d) The breeder wishes to improve yield. The average yield in the starting population is 400. Plants with an average yield of 500 are selected for breeding. What is the expected average yield among the offspring of the selected plants?

Toxin levels were measured in milkweed plants from a largecornfield in Iowa and found to have a mean level of 28.2 mg pergram and a variance of 15.3. Seeds were collected from these plantsand germinated in a single, large greenhouse allowing all plants togerminate and grow under identical environmental conditions. Atmaturity, 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 inthis cornfield population of milkweed? Remember that H2 =broad-sense heritability = VG/VP.

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