Glossary of "Evolution (4th ed.)" by Futuyma & Kirkpatrick (2017)
- Variation in a trait within a population, as measured by the variance that is due to genetic differences among individuals.
- Futuyma, D. J. & Kirkpatrick, M. 2017. Evolution, 4th ed. -xviii + 602 pp. Sinauer Associates, Inc., Sunderland.