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Abstract
Background: A teaching method to improve students’ ability to communicate ideas in genetics across the macro–micro levels of organisation was investigated in this study.
Purpose: It is designed to help students deconstruct the level of organisation of each tier of a genetic diagram, as the symbols used in such diagrams (i.e. lines and letters) can be too abstract to serve as hints for students to identify the level of organisation.
Design and method: The method employs hybrid dynamic visualisation, which combines static (e.g. a genetic diagram) and dynamic visualisations (e.g. meiotic cell division, fertilisation). The method also addresses the learning problem wherein students isolate the conceptual components of the processes of meiotic cell division and fertilisation from the procedural components of genetic diagrams. The new pedagogy was trialled in a voluntary enrichment course with 22 Secondary Six (or 12th grade) students.
Results: The results of conceptual assessments and individual interviews show that the participating students, in general, provided more explanations at the molecular level, although there is considerable room for improvement in making a smooth macro–micro transition. Students also had a better grasp of the symbolic representation and mathematical concepts of genetics. In addition, their responses in individual interviews revealed that they shared a restricted understanding of the term ‘recessiveness’.
Conclusion: Possible scaffolds for revisiting the concept of recessiveness in regular teaching are suggested.
Notes
1. Some questions were adapted from the Hong Kong Certificate of Education Examination (HKCEE; between 2004 and 2008 under the old education system) and Hong Kong Diploma of Secondary Education Examination (HKDSE, Citation2012).
2. Both local supplementary exercises written in accordance with the Biology Curriculum and Assessment Guide of the HKCEE and HKDSE, as well as overseas supplementary exercises written in accordance with the International Baccalaureate Diploma Programme and Advanced Placement examinations, were adapted.