I have students work in small groups. They each get a copy of the instruction manual and the data notebook, which I have attached below. They also get a coin, a six-sided die, and a 20-sided die. Since I am a gamer, the d20 made sense to me. I was also very happy to have an excuse to buy a bunch of dice at my local game store (I spent about $15 for 30 dice). However, the activity can easily be modified to use a coin and d6 only.
So if you are teaching about polymorphisms, polygenic traits, and pleiotropic genes, give this activity a try!