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Genetics, Vol 118, 437-443, Copyright © 1988
INVESTIGATIONS |
The Isolation of Polygenic Factors Controlling Bristle Score in Drosophila melanogaster. I. Allocation of Third Chromosome Sternopleural Bristle Effects to Chromosome Sections
A. E. Shrimpton and A. Robertson
Department of Genetics, University of Edinburgh, Edinburgh EH9 3JN, Scotland
A single third chromosome C, with a high sternopleural bristle score, had been extracted from an artificial selection line. C was divided into five chromosomal sections by recombination with a multiply marked third chromosome ruseca, which had a low sternopleural bristle score. A nonuniform distribution of sternopleural bristle effect with physical length of chromosome was observed. The second section (26-44 cM) of C carried the most sternopleural bristle effect (10 bristles when homozygous), the first (0-26 cM) and third (44-62 cM) also carried significant sternopleural bristle effects (six and five bristles, respectively). The fourth section (62-71 cM) carried a small but significant effect (less than one bristle) while the fifth section (71-101 cM) carried little effect when alone (less than one bristle), though it did carry effects which had an epistatic interaction with those of the first and second sections.
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