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Response to selection for increased pupa weight in Tribolium castaneum as related to population structure*

Published online by Cambridge University Press:  14 April 2009

Alan J. Katz  and
Franklin D. Enfield
Alan J. Katz
Affiliation:
University of Minnesota, Department of Genetics and Cell Biology, St Paul, Minnesota, U.S.A.55108
Franklin D. Enfield
Affiliation:
University of Minnesota, Department of Genetics and Cell Biology, St Paul, Minnesota, U.S.A.55108
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The effectiveness of selection for increased pupa weight in Tribolium was compared for three different selection systems. In all three systems the same number of breeding individuals was used each generation. Population L was a large random mating population with 24 males and 48 females selected each generation. The C4 and C8 populations were each divided into 6 subpopulations (lines) consisting of 4 males and 8 fem ales. Each of the three populations was replicated. In C4, selection for pupa weight was within lines for three generations, followed by a generation of among-line selection when the best two out of six lines were selected. These lines were then crossed to produce 6 new subpopulations, and the cycle was repeated. The C8 population was handled in exactly the same manner except that seven generations of selection within lines were practised before each generation of among-line selection. Selection response for the 42-generation period was significantly greater in the L population than in either subdivided population. No consistent differences among the selection systems were apparent when evaluating short-term response for the first 12 generations of the experiment. The results were interpreted as indicating that the influence of multiple-peak epistasis was not of major importance for this trait in determining ultimate response to selection when starting from a base population of previously unselected lines and utilizing a within- and among-line selection regime.

Type
Research Article
Information
Genetics Research , Volume 30 , Issue 3 , December 1977 , pp. 237 - 246
Copyright
Copyright © Cambridge University Press 1977

References

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