A case-based approach for integrating ecology and evolution education

Background/Question/Methods

we have developed four comprehensive cases (Mouse Fur Color, Pea Taste, Monkey Opsins, and Clam Toxin) that support integrative biology instruction. Each case presents an integrated, comprehensive approach to teaching evolution across biological sub-disciplines. These cases address evolutionary processes from their origination in DNA mutations, to the production of different proteins, to the fixation of alternate macroscopic phenotypes in reproductively isolated populations. Our goal in creating these cases was to provide web-based educational materials for post-secondary instructors that explicitly link molecular and cellular processes to evolution by natural selection. We designed the cases to be “instruction ready” and included a PowerPoint presentation, complete background information, graphics and data for each one. We also developed web-based simulations (games) for use by students. All materials are freely available at http://www.evo-ed.com.

Results/Conclusions

 To determine the effectiveness of the cases, we developed and used an open-ended assessment tool to evaluate student knowledge of evolutionary concepts. This assessment was administered at the beginning and at the end of a semester of instruction in introductory biology courses. It was designed to measure students’ ability to apply evolutionary principles in ecology (natural selection), genetics (mutation) and cell biology (the role of proteins). Validation of the assessment was done with student interviews. A preliminary analysis showed that students who had a better understanding of the case curriculum had a more complete understanding of evolutionary mechanisms.