Abstract

Natural populations of Drosophila melanogaster throughout the world are infected by a rhabdovirus called sigma, which is responsible for a specific symptom of CO2 sensitivity of the fly. The virus is not contagious from fly to fly, but is transmitted only through gametes (L’Heritier, 1970; Brun and Plus, 1980; Emeny and Lewis, 1984). There is no integration into the fly chromosomes and the virus multiplies in the cytoplasm. The sigma virus has been found in other species of Drosophila (Williamson, 1961; Felix et al., 1917b). The CO2 sensitivity symptom, which makes identification of infected flies easy, and the genetic knowledge we have of the host and of the virus make it possible to analyze the population genetics of the Drosophila—sigma system.

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