The PTC Gene and genetics. Geneticists determined that there is an inherited component that influences how we taste PTC. This kit is all you need for a controlled demonstration of genetics and heredity. These strips can be used to help determine if a person is a ‘supertaster’ and can effectively demonstrate the effects of heredity on taste. The set includes one vial of each of the following: PTC (pheylthiocarbamide), sodium benzoate, thiourea, and control paper and also includes instructions for a lab experiment. Supertasters have the TAS2R38 gene, a bitter taste receptor which enables them to detect PTC.