HHMI Biointeractive has lots of awesome resources for teaching Biology. For teaching genetics and evolution, they have multiple resources to accompany their video Making of the Fittest: Natural Selection in Humans. They are very good, but bulky. I didn't want to print a ton of pages for students. This is a resource I made by compiling a few key parts into a smaller document.
There is 1 page of background information from their resources and 4 pages of worksheets that include:
*natural selection critical thinking questions
*Punnett square problem
The worksheets are intended to be completed after watching the movie and require some prior genetics instruction. An answer key is included. This resource is free and editable. I hope you find it helpful. If you find it useful, then please leave me some positive feedback. Thanks! :)