Introductory biology students' conceptual models and explanations of the origin of variation.

ABSTRACT: Mutation is the key molecular mechanism generating phenotypic variation, which is the basis for evolution. In an introductory biology course, we used a model-based pedagogy that enabled students to integrate their understanding of genetics and evolution within multiple case studies. We used student-generated conceptual models to assess understanding of the origin of variation. By midterm, only a small percentage of students articulated complete and accurate representations of the origin of variation in their models. Targeted feedback was offered through activities requiring students to critically evaluate peers' models. At semester's end, a substantial proportion of students significantly improved their representation of how variation arises (though one-third still did not include mutation

SUBMITTER: Speth EB 

PROVIDER: S-EPMC4152213 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature