雄虫生殖力缺陷与果蝇性比特征。I. 精子排挤与性选择。
Virility Deficiency and the Sex-Ratio Trait in DROSOPHILA PSEUDOOBSCURA. I. Sperm Displacement and Sexual Selection.
机构信息
Institute of Animal Resource Ecology, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1W5.
出版信息
Genetics. 1983 Nov;105(3):651-62. doi: 10.1093/genetics/105.3.651.
Abstract
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.
摘要
性比（SR）现象与许多果蝇物种的 X 染色体有关。携带 SR 的雄性主要传递携带 X 染色体的精子。因此，SR 在分离中具有非常显著的优势。本文对生育力选择在防止 SR 固定中的作用进行了实验分析。发现 SR 雄性与非处女雌性交配时生育力会大幅降低，但与处女雌性交配时则不会。生育力下降的原因是它们在精子置换方面较弱，并且受到非处女雌性的歧视。SR 雄性的生育力缺陷在低温下更为严重。
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