Phenylthiourea, PTC, can be Taste it by some individuals but not by others. Students tested everyone in third grade to see who could taste PTC 100 students total. The ability to taste PTC is a dominant trait. 10 people in the great were unable to taste PTC

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.