Effective activity used to demonstrate how environmental factors can lead to evolutionary change by altering the frequency of alleles within a species.
The design of this document is functional for a "class set" of activity sheets, with students recording their data in the chart handout and then attaching in science notebook or online, but can also be modified to be a fill-in-the-blank worksheet for those who prefer that route. Since this is a Word Document, you can edit as you see fit. I buy the party toothpicks in the containers and then separate them out into various colors. I believe I bought as many containers of the toothpicks as their were colors given because it is nice to have extra toothpicks in case they break.