Evolution Is Deterministic (?)
Biologists have concluded that developmental evolution is deterministic and orderly, rather than random, based on a study of different species of roundworms. The researchers note that even where we might expect evolution to be random, it is not.
http://www.sciencedaily.com/releases/2007/11/071119123929.htm
Original study:
Kiontke, K., Barrière, A., Kolotuev, I., Podbilewicz, B., Sommer, R., Fitch, D. H. A., & Félix, M.-A. (2007). Trends, Stasis, and Drift in the Evolution of Nematode Vulva Development. Current Biology, 17(22), 1925–1937. doi:http://dx.doi.org/10.1016/j.cub.2007.10.061