Glossary of "Evolution (4th ed.)" by Futuyma & Kirkpatrick (2017)
- Properties of organisms or their environment that tend to retard evolution of a feature or to direct its evolution along some paths rather than others.
- Futuyma, D. J. & Kirkpatrick, M. 2017. Evolution, 4th ed. -xviii + 602 pp. Sinauer Associates, Inc., Sunderland.