Genetics, Vol 119, 435-444, Copyright © 1988


INVESTIGATIONS

Unidirectional Incompatibility in Drosophila simulans: Inheritance, Geographic Variation and Fitness Effects

A. A. Hoffmann and M. Turelli
Department of Genetics and Human Variation, La Trobe University, Bundoora, 3083 Australia

In California, Drosophila simulans females from some populations (type W) produce relatively few adult progeny when crossed to males from some other populations (type R), but the productivity of the reciprocal cross is comparable to within-population controls. These two incompatibility types are widespread in North America and are also present elsewhere. Both types sometimes occur in the same population. Type R females always produce type R progeny irrespective of the father's type. However, matings between R males and females from stocks classified as type W produce type R progeny at low frequency. This suggests rare paternal transmission of the R incompatibility type, as we have found no evidence for segregation of incompatibility types in the W stocks. There is quantitative variation among type R lines for compatibility with W females, but not vice versa. Population cage studies and productivity tests suggest that deleterious side effects are associated with the type R cytoplasm.


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