In this study we investigate students' ability to discern conceptual variation and the use of multiple models in genetics when reading content-specific excerpts from biology textbooks. Using the history and philosophy of science as our reference, we were able to develop a research instrument allowing students themselves to investigate the…

In this article we examine teacher instruction on scientific literacy tasks and teacher expression of ultimate and subordinate purposes during one teaching sequence of a science unit. By using a Practical Epistemology Analysis and Systemic Functional Grammar we can provide a view of the direction learning takes and the consequences for student…