This PowerPoint is a student centered activity that allows students generate Punnett squares for crosses between subjects which demonstrates the codominance of blood types. A Punnett Square is generated along with the percentages of each phenotype. This is especially great for beginners and students who need extra assistance. The PowerPoint acts as a personal tutor that allows students to check their understanding of Punnett Squares and how to interpret them. Every possible ABO blood type combination is included. This is a great compliment to my PowerPoint and Worksheets covering codominance dominance.