Data from: The sex with the reduced sex chromosome dies earlier: a comparison across the tree of life

Zoe A. Xirocostas, Susan E. Everingham & Angela T. Moles
Many taxa show substantial differences in lifespan between the sexes. However, these differences are not always in the same direction. In mammals, females tend to live longer than males, while in birds, males tend to live longer than females. One possible explanation for these differences in lifespan is the unguarded X hypothesis, which suggests that the reduced or absent chromosome in the heterogametic sex (e.g. the Y chromosome in mammals and the W chromosome in...
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