This is an extra credit assignment I created for my 7th grade Life Science class. I give this assignment to my students towards the end of my Genetics Unit. I give one to every student about 10 minutes before the period ends. We discuss the problem together and then set up the Punnett Square as a class. Then the students have a minute of two to start filling in their two trait Punnett Square. Then I give them a due date (about a week) and tell them to come see me for extra help if needed. Students LOVE doing this assignment and I get extra credit turned in from students who wouldn't normally turn it in.