Selection for Pattern of an Artificially Canalised Character

A scutellar bristle pattern of one anterior bristle plus one posterior on the opposite side was selected for 10 generations in a line of Drosophila melanogaster derived from the low variance scute line of Rendel and Sheldon (1960). The frequency of this type almost doubled in females from about 9.5...

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Bibliographic Details
Published in:The American naturalist 1965-11, Vol.99 (909), p.431-438
Main Author: Finlay, D. E.
Format: Article
Language:English
Subjects:
Bays
Bottles
Drosophila
Genetic variation
Ocelli
Phenotypes
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Summary:A scutellar bristle pattern of one anterior bristle plus one posterior on the opposite side was selected for 10 generations in a line of Drosophila melanogaster derived from the low variance scute line of Rendel and Sheldon (1960). The frequency of this type almost doubled in females from about 9.5 per cent to about 18 per cent, and also increased in males but to a smaller extent. Strength of canalisation about 2 bristles was not reduced by this change in bristle pattern, which reinforces Rendel's conclusion (1965) that it is bristle number rather than pattern that is canalised in the low variance line. This result is compared with changes in selected lines of the mutant ocelliless in Drosophila subobscura reported by Maynard-Smith and Sondhi (1960), where a change in pattern brought about by a shift in the anterior-posterior gradient appears to have been solely responsible for their reduction in variance.
ISSN:0003-0147
1537-5323
DOI:10.1086/282388