Students research modern DNA discoveries provided by the teacher as well as student selected discoveries. After summarizing each discovery, students reflect on the nature of science and identify and explain which NOS tenets are demonstrated in the DNA discoveries.

Learn about DNA. Deoxyribonucleic acid is the blueprint for all living things, but it is so small we can’t usually see it. The role of DNA is to provide our cells information on building proteins; these proteins lead to our individual traits such as eye color, height, dimples, and so much more. The structure of DNA is a double helix and we can model this structure at home. This model is based on the work of Rosalind Franklin, a British Chemist who created an X-ray photograph that provided evidence of the double-helix structure of DNA molecules. We can also extract DNA from a living thing, such as a strawberry, at home. The components of this DNA are so small that it does not look like our model; however, with technology scientists can both see the structure and manipulate the structure to change proteins in organisms. The key concepts and terms explored in this episode include DNA, nucleotides, genes, and genetically modified organisms (GMO's).

Students will participate in a 5E lesson. To ENGAGE, students will connect their understanding of the characteristics of life to the fundamental molecule of life: DNA. To EXPLORE, students will extract DNA from fruit in a hands on (or video of a) lab, and then, students will act as Watson and Crick and use clues to discover the structure of DNA. In the EXPLAIN section, students will use slides to fill out guided notes on the structure of DNA and RNA. To ELABORATE on their understanding of DNA, students can participate in the CRISPR-Cas9 interactive and the Regulation of the Lactase Gene click and learn. Formative evaluations of students's ability to model DNA include (1) using an online interactive, (2) using their bodies as a class, and (3) using a cut and paste model. Finally, the summative EVALUATE is a DNA Model FlipGrid in which students use various materials to construct and explain the structure of DNA.

This lesson is designed for a high school biology class, as it is dependent on students having some prior knowledge of the structure of DNA. It reviews/teaches the key features of DNA structure by allowing students to use the engineering design process to create their own DNA models, compare/contrast provided models, and then edit/assess their own designs.