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- W2164862488 abstract "ABSTRACT The Sex-ratio chromosome (SR) is a widespread, multiply inverted rearrangement of the X chromosome present in several species of Drosophila. Male carriers transmit mostly X-bearing sperm. In the absence ofstrong counteracting selection, SR is expected to increase rapidly to fixation, causing extinction. The present study incorporates a selection-components analysis of SR in laboratory populations, using the closely linked Esterase-5 locus as a marker. Estimated fitnesses show directional viability selection against SR in both males and females, heterosis for fertility and no significant effects on virility, the male adult component of fitness. Estimated fitnesses satisfy conditions for protected polymorphism and accurately predict gene-frequency trajectories in experimental populations. A model of SR gene-frequency evolution is developed, which incorporates sex-linkage, meiotic drive, viability, fertility and virility selecton. We show that conditions for protected polymorphisms are not unduly restrictive and that differential fitness among males is not sufficient for protected polymorphism, irrespective of the degree ofmeiotic drive." @default.
- W2164862488 created "2016-06-24" @default.
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- W2164862488 date "1980-02-01" @default.
- W2164862488 modified "2023-10-09" @default.
- W2164862488 title "EXPERIMENTAL AND THEORETICAL ANALYSIS OF THE SEX-RATIO POLYMORPHISM IN <i>DROSOPHILA PSEUDOOBSCURA</i>" @default.
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- W2164862488 doi "https://doi.org/10.1093/genetics/94.2.445" @default.
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