Figure 1.

Example of a student-generated SBF model (transcribed in cMapTools), labeled to illustrate the model components (in italics). The example illustrates how an SBF model is a semantic network of structures (in boxes, highlighted in green) linked by behaviors (on arrows, highlighted in blue). Each box-arrow-box group (such as the one highlighted in orange) should be readable as a stand-alone unit of meaning (a proposition). This model was developed in response to a prompt asking students to represent the origin of genetic variation and resulting phenotypic variation in a mosquito population that evolved resistance to DDT. The assignment was scaffolded by providing the structures: gene, allele, nucleotides (or nucleotide sequence), protein, and phenotype.