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Simultaneous selection for two correlated traits in Tribolium*

Published online by Cambridge University Press:  14 April 2009

A. E. Bell  and
Martin J. Burris
A. E. Bell
Affiliation:
Population Genetics Institute, Purdue University, Lafayette, Indiana 47907, U.S.A.
Martin J. Burris
Affiliation:
Population Genetics Institute, Purdue University, Lafayette, Indiana 47907, U.S.A.

Summary

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Simultaneous selection by independent culling levels of two correlated traits in all four combinations of directions was investigated with Tribolium in a replicated experiment extending over nine generations. In addition to the two primary traits, 13-day larval weight and pupal weight, four secondary traits (pupation time, adult emergence time, adult weight and larval number) were observed.

The observed responses for both selected and unselected traits agreed with theoretical expectations after the latter were adjusted for changes which occurred in genetic and phenotypic parameters. Phenotypio variances for the selected traits were correlated positively with population means, yet genetic variances and heritabilities declined in all selected populations. No change was detected in the genetic correlation between selected traits even though the divergent two-trait selection was designed especially to ‘break’ the positive correlation of + 0·55 ± 0·12 present in the base population.

Striking changes in growth and developmental patterns resulting from the divergent selection were discussed in terms of metamorphic limits and ‘stabilizing’ genetic correlations.

Type
Research Article
Information
Genetics Research , Volume 21 , Issue 1 , February 1973 , pp. 29 - 46
Copyright
Copyright © Cambridge University Press 1973

References

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