Sex specific gene

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To learn if sex-specific selection is more prevalent among genes with certain functions, we identified the SNP with the highest F ST at each locus, since this SNP is more likely to be the target of selection. File S1 contains descriptions of all the data and their GEO submission nos. Because SDC proteins control both sex determination and dosage compensation, the effects of those two processes on gene regulation are coupled.

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XX males and C XO hermaphrodites vs. Thus, sex-biased gene expression on the X chromosomes is shaped by the mechanisms that regulate X chromosome expression in different tissues and species.

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We categorized genes with high and low sex-biased expression based on a log 2 expression ratio cutoff of 3. Sex chromosomes and the evolution of sexual dimorphism.

This measure is highly correlated with the familiar log 2 of the expression ratio. Answers to these questions are important to our understanding of how sexual dimorphism evolves. B Comparing mutant strains to wild-type males or hermaphrodites allows isolation of sex and X dose effect.

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Uncoupling X chromosome number from sex in C. A summary of all the data sets including replicates, read numbers, mapping percentages and correlations between replicates is provided in Supplemental Material, File S1. The Twin Peaks pattern appears again when we use the average expression of the four female-specific somatic tissues and expression in testes, but not when we use prostate instead of testes. A simple model explains Twin Peaks To understand the Twin Peaks pattern, we built a simple model that relates gene expression to fitness.
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  1. We note, however, that the Twin Peaks pattern in flies does result from sexually-antagonistic and not sexually-concordant selection. Escape from dosage compensation has been best studied in mammals, where one of the two X chromosomes is silenced in females.