Weakened purifying selection leads to elevated mutation load under environmental sex determination.

Abstract excerpt

In many gonochoristic taxa, sex is influenced by developmental environment, a system that can lead to temporal fluctuations in offspring sex ratio. Demographic models suggest that only short-lived species with environmental sex determination (ESD) are negatively impacted by sex-ratio fluctuations, yet these models fail to account for the potential mutation load associated with reductions in genetically effective...

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