The role of conflict in the formation and maintenance of variant sex chromosome systems in mammals

The XX/XY sex chromosome system is deeply conserved in therian mammals, as is the role of Sry in testis determination, giving the impression of stasis relative to other taxa. However, the long tradition of cytogenetic studies in mammals documents sex chromosome karyotypes that break this norm in myriad ways, ranging from fusions between sex chromosomes and autosomes to Y chromosome loss. Evolutionary conflict, in the form of sexual antagonism or meiotic drive, is the primary predicted driver of sex chromosome transformation and turnover. Yet conflict-based hypotheses are less considered in mammals, perhaps because of the perceived stability of the sex chromosome system. To address this gap, we catalogue and characterize all described sex chromosome variants in mammals, test for family-specific rates of accumulation, and consider the role of conflict between the sexes or within the genome in the evolution of these systems. We identify 152 species with sex chromosomes that differ from the..., , , # Data from: The role of conflict in the formation and maintenance of variant sex chromosome systems in mammals

[https://doi.org/10.5061/dryad.zw3r228gp](https://doi.org/10.5061/dryad.zw3r228gp)

A zip folder containing all raw data and R code used for analyses and for figure production. 

## Usage note

#### The R scripts herein require three additional files to be downloaded from S8 Data at [https://datadryad.org/stash/dataset/doi:10.5061/dryad.tb03d03](https://datadryad.org/stash/dataset/doi:10.5061/dryad.tb03d03) (Upham et al. 2019). All three are used unedited from the original repository and should be placed in the \"rate\_estimation\" subfolder.

* ##### DR-SUMMARY\_MamPhy\_BDvr\_Completed\_5911sp\_topoCons\_NDexp\_all10k\_v2\_expanded.txt
* ##### MamPhy\_5911sp\_tipGenFamOrdCladeGenesSampPC\_NDexp\_DRstats\_DRtreeLABELS.csv
* ##### MamPhy\_fullPosterior\_BDvr\_Completed\_5911sp\_topoCons\_NDexp\_MCC\_v2\_target.tre

## Contents of zip folder

##### --File: **families\_of\_inter...