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VIRILITY DEFICIENCY AND THE SEX-RATIO TRAIT IN DROSOPHILA PSEUDOOBSCURA. I. SPERM DISPLACEMENT AND SEXUAL SELECTION
Chung-I Wu 1
1 Institute of Animal Resource Ecology, The University of British
Columbia, Vancouver, British Columbia, Canada V6T 1W5
The Sex-Ratio (SR) phenomenon is associated with the X chromosome of many species of Drosophila. Males carrying SR transmit predominantly sperm bearing the X chromosome. SR, therefore, has a very significant advantage in segregation. This paper provides an experimental analysis of the role of virility selection in preventing the fixation of SR. SR males are found to suffer substantial virility reduction when mated with nonvirgin females but not with virgin females. The reduced virility arises because they are weaker in sperm displacement and are discriminated against by nonvirgin females. The virility deficiency of SR males is even more severe at low temperatures.
Submitted on May 5, 1982Accepted on June 25, 1983
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