Effect of A49P genotype on sensitivity to the bitter taste of PROP. The cumulative percentage of children (A) and mothers (B) in each of the 3 allele groups (AA, AP, PP) who first detected a bitter or “yucky” taste when sampling 560, 180, and 56 μmol/L of PROP or who never detected a bitter taste when sampling each of these PROP solutions (none tasted bitter).
Effect of A49P genotype on maternal perception of children's emotionality (scores could range from 1 to 5). ▪, Children who are heterozygous or homozygous for the bitter-sensitive allele; □, children who are homozygous for the insensitive nontaster allele. AP/PP children of AA mothers were significantly more likely to be perceived as emotional when compared with the remaining groups (*P = .03).