Module 8 Lesson 1 - 5

Lesson Summary

When gene pool allele frequencies remain the same over time, the population is in Hardy-Weinberg equilibrium. Conditions needed for Hardy-Weinberg equilibrium are a closed population, a large population, no net change in mutation rate, random mating, and no natural selection.

If these conditions are not met, allele frequencies will change and the population will evolve. Therefore, the conditions for evolution are an open population (gene flow), a small population (genetic drift), change in mutation rate, non-random mating, and natural selection.