Directional selectional for heavier pupa weight in Tribolium castaneum was practiced for ten generations in two replicates of an inbred line that had been seperately maintained in population cages for more than 90 generations. The response to selection was used in a prediction equation developed by Hill (1982) to estimate mutational variance in the two populations. Estimates of the ratio of mutational to environmental variance ranged from .0002 to .0015 depending upon the assumptions made concerning the effective population sizes that had been maintained in the population cages. The results support the argument that mutation may have played a significant role in supplying new genetic variation for the long continuing response to selection in experiments reported earlier. A second experiment designed specifically to test the predictive theory on response to directional selection from new mutations is described.

F. D Enfield

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 144–151, 1986
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