Summary
1. From a base population showing some flies with more than the normal 4 scutellar chaeta phenotype directional selection was carried out and lead to a line with many flies having 6 chaetae. 2. Selection was then practised for 6 chaetae such that the extra 2 chaetae were in the anterior left and anterior right positions on the scutellum. This lead to a line with most flies having this chaeta number and pattern, therefore showing some canalization. 3. Additive genetic activity controlling the increased chaeta number was found on all the 3 major chromosomes.
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MacBean, I.T., McKenzie, J.A. & Parsons, P.A. Selection for six scutellar chaetae in Drosophila melanogaster . Theoret. Appl. Genetics 42, 12–15 (1972). https://doi.org/10.1007/BF00306072
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DOI: https://doi.org/10.1007/BF00306072