Yuck! That tastes terrible : discovering a unique genetic trait.

In this genetic trait research activity, students will have fun discovering who makes a face when they taste PTC-treated strips. PTC (phenylthiocarbamide) is a chemical that has been widely used to detect genetic variation in tasting ability. Students will conduct the taste test experiment, gather data, use the Punnett square, graph the class findings, and design a simple research project to find correlations between tasters and non-tasters, and taste preferences or other genetic traits. [Source : Smithsonian Science Education Center]