In this experiment, students will use punnett squares to identify which members of a family are able to donate blood to each other. (Prior to this lab, students should understand how pedigrees are set up and how blood types are passed down from parent to offspring using punnett squares). Genetics can be fun to teach, but hard to find easy and inexpensive labs. This lab is easy to set up, uses inexpensive materials, and gives fool-proof results!Materials needed: Test tubes or vials with racks OR