“…In South Africa, a further demand on the conceptual literacy of the Life Sciences teacher is the new content foci such as HIV/AIDS, evolution, environmental education, cloning and genetically modified products. In a review of research on science teacher education in this country Adler, Pournara, Taylor, Thorne, and Moletsane (2009) observe that due to the knowledge growth in these fields, teachers need to engage with scientific literature in order to keep abreast of new developments. Teachers also need to transform their new knowledge 'into useful forms of representations of ideas' such as 'powerful analogies, illustrations, examples, explanations and demonstrations', which will allow for easier comprehension by learners (Shulman, 1986, p. 9).…”