A person's ability to taste or not taste the the PTC paper is the person's and this is determined by the persons's

Answer 1

genetic makeup. Taste sensitivity to PTC is inherited, with some individuals being able to taste the bitterness of PTC paper while others cannot. This genetic trait is controlled by a specific gene known as TAS2R38. Individuals who are tasters have at least one copy of the "taster" version of this gene, while non-tasters have two copies of the "non-taster" version.