Atavisms: Medical, Genetic, and Evolutionary Implications

@article{Tomi2011AtavismsMG,
  title={Atavisms: Medical, Genetic, and Evolutionary Implications},
  author={Nenad Tomi{\'c} and Victor Benno Meyer-Rochow},
  journal={Perspectives in Biology and Medicine},
  year={2011},
  volume={54},
  pages={332 - 353}
}
Traits expected to be lost in the evolutionary history of a species occasionally reappear apparently out of the blue. Such traits as extra nipples or tails in humans, hind limbs in whales, teeth in birds, or wings in wingless stick insects remind us that certain genetic information is not completely lost, but can be reactivated. Atavisms seem to violate one of the central evolutionary principles, known as Dollo’s law, that “an organism is unable to return, even partially, to a previous stage… 

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