Evolution of the avian sex chromosomes from an ancestral pair of autosomes.

@article{Fridolfsson1998EvolutionOT,
  title={Evolution of the avian sex chromosomes from an ancestral pair of autosomes.},
  author={A K Fridolfsson and Houlong Cheng and Neal G. Copeland and Nancy A. Jenkins and H C Liu and T Raudsepp and Trevor Woodage and Bhanu Chowdhary and Joy L Halverson and Hans Ellegren},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1998},
  volume={95 14},
  pages={
          8147-52
        }
}
Among the mechanisms whereby sex is determined in animals, chromosomal sex determination is found in a wide variety of distant taxa. The widespread but not ubiquitous occurrence, not even within lineages, of chromosomal sex determination suggests that sex chromosomes have evolved independently several times during animal radiation, but firm evidence for this is lacking. The most favored model for this process is gradual differentiation of ancestral pairs of autosomes. As known for mammals, sex… CONTINUE READING

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