This is a “true” story). At a college fair, the biology department was using PTC paper to demonstrate dominant and recessive phenotypes. People who have a copy of the dominant allele (T) can taste the PTC. Non-tasters have two copies of the recessive allele (t). A married couple with a baby came up to the demonstration. The husband and wife determined they were both non-tasters. The husband put a strip of PTC paper into the baby's mouth and the baby made a face and spit it out. To see if it was just paper the baby didn't like, the husband gave the baby a regular piece of paper with no PTC on it. The baby happily sucked on the plain paper. The husband gave the baby another piece of PTC paper, and the baby spit it out immediately and began to cry. A while later the couple was seen with the wife crying and the husband yelling