Glossary of "Evolution (4th ed.)" by Futuyma & Kirkpatrick (2017)
- The evolution of increasing difference between lineages in one or more characters.
Glossary of "Ancestors in Our Genome" by Harris (2015)
- the gradual accumulation of DNA differences between two different populations or species since they split from their most recent common ancestor.
- Futuyma, D. J. & Kirkpatrick, M. 2017. Evolution, 4th ed. -xviii + 602 pp. Sinauer Associates, Inc., Sunderland.
- Harris, E. E. 2015. Ancestors in Our Genome: the New Science of Human Evolution. - xx + 226 pp. Oxford University Press, New York.