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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Rare-male mating advantage in Drosophila ananassae | 447 Genet. Sei. Evol. 1989 21 447-455 Elsevier INRA Original article Rare-male mating advantage in Drosophila ananassae B.N. Singh and s. Chatterjee Centre of Advanced Study in Zoology Genetics Laboratory Banaras Hindu University Varanasi 221 005 India received 5 April 1989 accepted 30 August 1989 Summary - Minority-male mating advantage is a phenomenon whereby genetic variability can be maintained in populations without genetic load at equilibrium Rare-male mating advantage has been shown to be a widespread phenomenon in Drosophila although it is seen to be absent in some species. During the present investigation experiments were conducted to study the mating success of wild type and mutant males at different ratios in the Elens-Wattiaux mating chamber using sepia and cardinal mutant stocks and a wildtype stock in order to detect a rare male effect in D. ananassae. In all the experiments the female-choice technique was employed. Red eye males were tested separately with sepia and cardinal mutants. Experiments were conducted at 9 different ratios. The results show that although both types of males are equally successful in mating when present in the same ratio they are more successful in mating when in a minority. This advantage disappears when the males become common. Thus the present results provide evidence for the existence of a minority-male mating advantage in D. ananassae. Drosophila ananassae sepia and cardinal mutants rare male mating advantage Resume - L avantage au male rare chez Drosophila ananassae. L avantage donné aux males de genotypes minoritaires ậ I occasion des appariements est un phénomène susceptible de maintenir une variabilité génétique sans induire de fardeau génétique dans une population en équilibre. C est un phénomène très répandu chez les Dorsophiles mais absent dans certaines espèces. Le succès à I appariement de males de type sauvage et de mutants a été étudié en utilisant la technique du choix par la femelie avec neuf proportions .
