Visual demonstrations of abstract scientific concepts are effective strategies for enhancing content retention (Shmaefsky 2004). The concepts associated with gene regulation of growth and development are particularly complex and are well suited for teaching with visual models. This demonstration provides a simple and accurate model of Hox gene function related to skeletal morphology in animals. The model used in this demonstration can be adapted to plant flower, fruit, leaf, and stem morphology. (Contains 2 figures.)