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Genetics, Vol 140, 659-666, Copyright © 1995
INVESTIGATIONS |
Cellular Basis and Developmental Timing in a Size Cline of Drosophila melanogaster
A. C. James, RBR. Azevedo and L. Partridge
ICAPB, Division of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JT, United Kingdom, and Department of Genetics and Biometry, Galton Laboratory, University College London, NW1 2HE, United Kingdom
We examined 20 Drosophila melanogaster populations collected from a 2600-km north-south transect in Australia. In laboratory culture at constant temperature and standard larval density, a genetic cline in thorax length and wing area was found, with both traits increasing with latitude. The cline in wing area was based on clines in both cell size and cell number, but was primarily determined by changes in cell number. Body size and larval development time were not associated among populations. We discuss our results in the context of selection processes operating in natural and experimental populations.
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