In this genetics activity, learners create imaginary creatures known as "Reebops" to explore the relationships between genes and inherited traits. Using Reebops as a model, learners investigate how hereditary information is passed from one generation to the next, and how the physical appearance of offspring is determined from the combinations of genes received from parents. This activity guide includes detailed background information, glossary, and handouts. [Activity is publicly available through a web crawler capture on Archive.org.]