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D4.1.12—Differences between directional, disruptive and stabilizing selection

Experiments

Here are experiments our science specialists have selected to support this IB* topic.

Population Genetics and Evolution

Experiment #8 from Advanced Biology with Vernier

In this experiment, you will

  • Investigate a genetically inherited trait and apply the Hardy-Weinberg Principle to a population.
  • Calculate allele frequencies and genotypes for a population using the Hardy-Weinberg formula.
  • Compare allele frequencies within the classroom to North American averages.
  • Demonstrate the stability of allele frequencies over five generations in an ideal Hardy-Weinberg population.
  • Examine the effects of natural selection, heterozygous advantage, and genetic drift on allele frequencies in a simulated mating exercise.

Educational Standard
International Baccalaureate (IB) 2025
Subject
Biology
Theme
D Continuity and change
Level of organization
4 Ecosystems
Topic
D4.1 Natural selection
Section
Additional higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.

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