THE CYTOPLASMICALLY-INHERITED "SEX-RATIO" CONDITION IN NATURAL AND EXPERIMENTAL POPULATIONS OF <i>DROSOPHILA BIFASCIATA</i>

Abstract

HE cytoplasmically-inherited "sex-ratio" condition (SR) has been analyzed by many workers. BUZZATI-TRAVERSO (1941) first reported "sex-ratio" females in Drosophila bilineata (=D. bijasciata) collected in natural populations in Italy. "Sex-ratio" females of the same species were found in Pavia, Italy Further examples of the "sex-ratio" condition have been reported in Drosophila prosaltans ( CAVALCANTI and FALCAO 1954), D. borealis (CARSON 1956), D. willistoni (MALOGOLOWKIN 1958), D. equinoxialis (MALOGOLOWKIN 1959a), D. nebulosa (POULSON and SAKAGUCHI 1960b) and D. robusta (POULSON 1966).