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A plant breeder has determined the following variances for yield of corn in his fields:
Total phenotypic variance - 100
Additive genetic variance - 30
Dominance genetic variance - 50
Environmental variance - 20
Assume that there is not genetic-environmental interaction or other variances.
(a) Calculate the total genetic variance.
(b) Calculate the broad-sense heritability indicated by this data.
(c) Calculate the narrow-sense heritability indicated by this data.
(d) The breeder wishes to improve yield. If the average yield in the starting population is 400 and he selects for breeding plants with an average yield of 500, what will be the expected average yield among the offspring of the selected plants?
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