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The Journal of Heredity 1984:75(4):260-264
© 1984 The American Genetic Association 75:260-264

research-article

A "sex-ratio" condition in Oncopeltus fasciatus

James F. Leslie

Program in Evolutionary Biology and Behavior, Department of Zoology, University of Iowa Iowa City, IA 52242

Abstract

Most sexually reproducing species produce nearly equal numbers of female and male offspring. In natural populations, significant departures from equal sex ratios frequently are due to some type of clonal reproduction. Less frequently, distorted sex ratios are due to nuclear or cytoplasmic factors, such as "sex-ratio" in Drosophiia. This report describes initial studies on a "sex-ratio" factor in milkweed bugs that seems similar to the cytoplasmic sex-ratio organism system in several Drosophila species. This type of cytoplasmic male-lethal factor has now been reported in three orders of insects: Diptera, Hymenoptera, and Hemiptera. Thus, the phenomenon may be wklespread in insects and offers a new approach to evaluating the coevolutionary theory and the evolution of disease pathogenicity


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