This vial contains 100 phenylthiourea (PTC) test strips for genetic taste testing. Each strip is coated with PTC, a chemical compound that approximately 70% of people can taste as bitter, while the remaining 30% cannot detect any flavor. PTC taste sensitivity is a genetic trait commonly used in biology classrooms to demonstrate Mendelian inheritance, genetics, and heredity. Each strip contains a safe quantity of PTC for taste testing. The clear storage vial keeps strips dry and accessible.