As unlikely as it seems, genetics and robotics actually go hand in hand- the structure of an organism is determined by the components that comprise it, and those components are, in turn determined by the blueprint. In the case of reality, that blueprint just happens to be deoxyribose nucleic acid, and in the case of a robot, the blueprint might be CAD drawings or a written description. those components reflect that work together. Have the students spend time studying the components; afterward, incorporate a challenge by restricting the components they can use in the construction process.