This activity introduces students to the immunity of the A-B-O blood groups. The last portion of the activity engages the students in s simulated paternity case. Save money by making your own simulated blood types and not purchasing them using the recipes provided at the end of this activity. This lab activity has been correlated to both the New York State Living Environment performance indicators and Next Generation Science Standards. These are also listed at the end of the activity. This product may be downloaded in a zip file which contains the activity and an answer key for the activity.