Abstract
Analysis of data from spaced plant nurseries on spread or “creep” of alfalfa parents and individual offspring indicated unexpectedly large estimates of genetic variance for clones and plants within families. These enhanced variances could not be explained by tetrasomy, linkage, or epistasis. The data could be largely explained by postulating a positive correlation between genetic effects and environmental effects. The rationale underlying the postulate was given. The chief consequence to the breeder was seen to be lowered heritability, and on that account, trivial gains from selection under the conditions of these trials.
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