A model of the evolution of the unusual sex chromosome system of Microtus oregoni

@article{Charlesworth2001AMO,
  title={A model of the evolution of the unusual sex chromosome system of Microtus oregoni},
  author={Brian Charlesworth and Naomi Dempsey},
  journal={Heredity},
  year={2001},
  volume={86},
  pages={387-394}
}
In the creeping vole, Microtus oregoni, females are X0 and males are XY. In the female germ line, mitotic nondisjunction ensures that the products of meiosis all carry the X chromosome. Similarly, mitotic nondisjunction in the male germ line leads to the production of 0 and Y sperm. We propose that the present situation in M. oregoni has evolved by invasion of a normal XX/XY system by a mutant X chromosome, X′, with a complete transmission advantage in X′X females, and a complete transmission… 
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