There are three puzzles in this activity that will give students practice with Punnett squares. Depending on your students and the time available, you may decide to use one, two, or all three puzzles. You could also assign one or more of these puzzles for homework. In this activity, students have to come up with the genotypes of the parents from the given genotypes or outcomes of the offspring bots. This is the reverse of a typical Punnett square activity. The PDF includes answer keys.