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A4.1.3—Evidence for evolution from selective breeding of domesticated animals and crop plants


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

Evolution of Yeast

Experiment #22 from Investigating Biology through Inquiry

In this Preliminary Activity, you will use a CO2 Gas Sensor to determine the rate of respiration of glucose by baker’s yeast.

After completing the Preliminary Activity, you will first use reference sources to find out more about yeast strains that are used in baking and brewing before you choose and investigate a researchable question dealing with the evolution of yeast through artificial selection. Some topics to consider in your reference search are:

  • Saccharomyces cerevisiae
  • Saccharomyces bayans
  • beer yeast
  • wine yeast
  • artificial selection
  • evolution
  • baking
  • monosaccharides
  • disaccharides
  • metabolism

Educational Standard
International Baccalaureate (IB) 2025
A Unity and Diversity
Level of organization
4 Ecosystems
A4.1 Evolution and speciation
Standard level and 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.