A Classification of Possible Routes of Darwinian Evolution
Journal article published in 2000 by
Richard H. Thornhill,
David W. Ussery 
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Abstract
A classification of four possible routes of Darwinian evolution is presented. These are serial direct evolution, parallel direct evolution, elimination of functional redundancy, and adoption from a different function. This classification provides a conceptual framework within which to investigate the accessibility by Darwinian evolution of complex biological structures.