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Journal of Heredity 2004:95(1)
© 2004 The American Genetic Association 95:70-75

Brief Communication

Modes of Selection and Recombination Response in Drosophila melanogaster

C. F. Rodell, M. R. Schipper, and D. K. Keenan

From the Department of Biology, College of St. Benedict/St. John's University, Collegeville, MN 56321 (Rodell), Tuff Cut Landscape, 115 Alabama St. SE, Lonsdale, MN 55046 (Schipper), and Department of Philosophy, Fairfield University, Fairfield, CT (Keenan).

Address correspondence to Charles F. Rodell at the address above, or e-mail: crodell{at}csbsju.edu.

A selection experiment for sternopleural bristle number in Drosophila melanogaster was undertaken to analyze the correlated effects on recombination. Replicate lines were subjected to divergent directional selection and to stabilizing selection. Recombination rates for markers on chromosomes 2 (dp-cn-bw) and 3 (se-ss-ro) were compared to those from a control. All lines responded as predicted for bristle number. Lines selected for both increased and decreased bristle number exhibited significantly increased recombination rates. The predicted recombination response from stabilizing selection is suggested by our data, but only one comparison is statistically significant. These results, taken with other studies, support the proposal that genetic recombination enhances individual fitness when populations are experiencing environmental change. Less conclusively, our results suggest that populations undergoing stabilizing selection may respond by reducing their rates of crossing over.


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