Abstract
Numerous species have primary sex ratios of 0.5, but few studies have experimentally addressed the evolutionary processes resulting in these equal sex ratios. A model based on Fisher's principles for sex-ratio evolution using a single-locus, three-factor (W, X, Y) system of sex determination was used to generate predictions concerning the dynamics of sex-ratio evolution. Predictions of this model were tested experimentally with the platyfish, Xiphophorus maculatus. The three-factor system of sex determination found in this species provides the genetic variability in sex ratio necessary to test sex-ratio evolution. Experimental populations were established with biased sex ratios. The sex ratios in these populations converged toward 0.5 along the predicted pathways, but in some cases the allele and genotype frequencies deviated quantitatively from predicted values. Differences between the observed and predicted allele and genotype frequencies likely result from sources of selection other than sex-ratio sele...
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