5. How Selection Changes the Genetic Composition of Population
Edward P. Bass Professor of Ecology and Evolutionary Biology
This lecture from Yale's EEB 122 course examines the mathematical principles governing genetic change under selection. It contrasts rates of adaptive change across asexual/haploid and sexual/diploid genetic systems, demonstrating how gene frequencies are altered by selective pressures.
Principles of Evolution, Ecology and Behavior (EEB 122)
Genetics controls evolution. There are four major genetic systems, which are combinations of sexual/asexual and haploid/diploid. In all genetic systems, adaptive genetic change tends to start out slow, accelerate in the middle, and occur slowly at the end. Asexual haploids can change the fastest, while sexual diploids usually change the slowest. Gene frequencies in large populations only change if the population undergoes selection.
4. Neutral Evolution: Genetic Drift
Next · Lecture 66. The Origin and Maintenance of Genetic Variation