It has been shown that active learning strategies used in the classroom can increase student learning and retention of information. We generated an active learning exercise that can be used in the classroom to explore the relationship between genes, mutations, cancer, and cancer therapeutics. The learning objectives for this exercise include defining and understanding the functional relationships between genes that regulate cell division, major types of mutations, and the onset of cancer. The active learning exercise begins with a take home quiz to define terms related to the information covered during the lecture portion of the class. Students are then divided into groups to generate a concept map that displays the interrelationships between these terms. Each group is then instructed to exchange their concept maps with another group, evaluate the map for accuracy, and identify targets for inhibiting or activating drug therapies. The lesson plan was implemented in undergraduate biology courses at two public universities. Survey data indicate that students perceived the activity helped increase their knowledge and understanding of the learning objectives.