An upper-level biology activity, the comprehensive worksheet found here accompanies a PowerPoint and the video The Making of the Fittest: The Birth and Death of Genes, both of which are linked to through the website. Depending on the learning styles of your future biologists, the questions could be answered in groups, discussed in class, or assigned as homework. There are several other activities that go along with the video, making it very convenient to differentiate for learners of all abilities and language levels.