In this game (on pages 14-21), learners explore how each human being inherits genetic traits such as eye color. Learners use "Smiley Mother's Genes" cards and "Smiley Father's Genes" cards to "mate" them into a Smiley Face Baby that the learner draws. The Mating Game Results page shows how the pairs translate into features such as face, eye, and mouth shape, skin color, hair type, and sex. The Thinking It Over section asks questions about how learners would feel if their baby had "Upsidedown Smile Syndrome," which can open up a discussion about genetic engineering.