Chapter 5.2
Genetic Drift & Population Changes: How Chance Shapes Evolution
Discover how random events not just survival of the fittest can permanently alter the genetic makeup of populations through genetic drift, the bottleneck effect, and the founder effect.
What You'll Learn
Genetic drift randomly changes allele frequencies regardless of fitness advantages.
Bottleneck and founder effects drastically reduce a population's genetic diversity.
Allele fixation eliminates genetic variation, increasing a population's extinction risk.
Genetic drift interacts with selection, mutation, and gene flow to drive evolution.
What You'll Practice
1
Students distinguish genetic drift from natural selection using real scenarios.
2
Questions test understanding of bottleneck effect and founder effect mechanisms.
3
Learners apply Hardy-Weinberg equilibrium and allele fixation concepts accurately.
Why This Matters
Understanding genetic drift equips students to explain how random chance shapes the genetic diversity of populations, a concept central to conservation biology, medicine, and evolutionary science.
This Unit Includes
Practice exercises
Learning resources
Skills
Genetic Drift
Bottleneck Effect
Founder Effect
Allele Fixation
Population Genetics
