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Monday, November 04, 2013

Getting Evo-Devo: Concepts and Challenges for Students

Getting Evo-Devo

Useful article for anyone involved in teaching these fundamental concepts.
"Evo-devo content presents students with new conceptual challenges and potential difficulties in attempting to understand evolution. For example, while several evo-devo concepts rely on the supporting concept (SC) of conserved gene networks that operate in a variety of developmental contexts, many students hold that each trait of an observed phenotype is the result of the expression of a single gene. Improving strategies for teaching evo-devo will benefit from an inventory of concepts appropriate for undergraduates, a learning progression toward their mastery, and a description of their attendant conceptual difficulties."

Hiatt, A., Davis, G.K., Trujillo, C., Terry, M., French, D.P., Price, R.M., & Perez, K. E. (2013) Getting to Evo-Devo: Concepts and Challenges for Students Learning Evolutionary Developmental Biology. CBE-Life Sciences Education, 12(3), 494-508.
Abstract: To examine how well biology majors have achieved the necessary foundation in evolution, numerous studies have examined how students learn natural selection. However, no studies to date have examined how students learn developmental aspects of evolution (evo-devo). Although evo-devo plays an increasing role in undergraduate biology curricula, we find that instruction often addresses development cursorily, with most of the treatment embedded within instruction on evolution. Based on results of surveys and interviews with students, we suggest that teaching core concepts (CCs) within a framework that integrates supporting concepts (SCs) from both evolutionary and developmental biology can improve evo-devo instruction. We articulate CCs, SCs, and foundational concepts (FCs) that provide an integrative framework to help students master evo-devo concepts and to help educators address specific conceptual difficulties their students have with evo-devo. We then identify the difficulties that undergraduates have with these concepts. Most of these difficulties are of two types: those that are ubiquitous among students in all areas of biology and those that stem from an inadequate understanding of FCs from developmental, cell, and molecular biology.





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