Abstract
There is emerging interest on the interactions between modelling and argumentation in specific contexts, such as genetics learning. It has been suggested that modelling might help students understand and argue on genetics. We propose modelling gene expression as a way to learn molecular genetics and diseases with a genetic component. The study is framed in Tiberghien’s (2000) two worlds of knowledge, the world of “theories & models” and the world of “objects & events”, adding a third component, the world of representations. We seek to examine how modelling and argumentation interact and connect the three worlds of knowledge while modelling gene expression. It is a case study of 10th graders learning about diseases with a genetic component. The research questions are as follows: (1) What argumentative and modelling operations do students enact in the process of modelling gene expression? Specifically, which operations allow connecting the three worlds of knowledge? (2) What are the interactions between modelling and argumentation in modelling gene expression? To what extent do these interactions help students connect the three worlds of knowledge and modelling gene expression? The argumentative operation of using evidence helps students to relate the three worlds of knowledge, enacted in all the connections. It seems to be a relationship among the number of interactions between modelling and argumentation, the connections between world of knowledge and students’ capacity to develop a more sophisticated representation. Despite this is a case study, this approach of analysis reveals potentialities for a deeper understanding of learning genetics though scientific practices.
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Acknowledgements
Work supported by the Spanish Ministry of Economy, Industry and Competitiveness, code EDU2015-6643-C2-2-P. The authors thank the teachers and students’ participation.
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Appendix 1
Appendix 1
Task “Modelling gene expression to explain sickle cell disease”.
The task shows two microscope photographs of two blood samples: one from an individual with sickle cell disease; and another from an individual not affected by the disease. The task is contextualized with these piece of news.
Galicia champions the heel prick test |
The Ministry of Health establishes basic neonatal screening for every community covering seven diseases, already included in the Galician program. (...) |
The Galician screening program covers seven diseases, now included in the service portfolio of the national health system, except for sickle cell disease, according to the Directorate General of Public Health of the Ministry of Health, on which it depends, which ensures that it is to be included in the coming months. |
http://www.farodevigo.es/sociedad-cultura/2013/12/16/galicia-abandera-prueba-talon/933476.html |
Students are asked to explain the similarities and differences between the photographs and, after sharing ideas, they carry out the following activities:
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1.
How is the phenotype formed from the information contained in the DNA?
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2.
Elaborate the gene expression model to explain sickle cell disease.
Questions for each group
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2.1.
Explain your model.
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2.2.
What criteria did you follow to build it?
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2.3.
Was the model agreed in the group? Explain it.
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2.4.
Present the poster with the expression model to your other classmates.
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Puig, B., Ageitos, N. & Jiménez-Aleixandre, M.P. Learning Gene Expression Through Modelling and Argumentation. Sci & Educ 26, 1193–1222 (2017). https://doi.org/10.1007/s11191-017-9943-x
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DOI: https://doi.org/10.1007/s11191-017-9943-x