Abstract
Direct artificial selection for a specific pattern, in the number and position of extra bristles, was carried out in a wild-type population of Drosophila melanogaster to canalize (estimated by probit width) the selected phenotypes. From the same population, independent lines were selected for extra dorsocentral bristles (lines D3 and D4) and for extra scutellar bristles (lines E2, E3, and E4). Differences at canalization between both dorsocentral and scutellar systems were detected. Results fit an independent control hypothesis for canalization, at two symmetrical extra bristles, in the main regions in which extra bristles appear.
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