In any given population, the number of people who are unable to taste PTCâ€™s bitterness is usually higher than the number of those who can taste it.5Â The implication is that the prevalence of the non-tasting allele is quite high. It is interesting to note that human senses are wired to relate bitter tasting substances to toxins. As such, one would expect that many people will be able to detect bitter substances like PTC. However, the case is different due to natural selection. As a result of this selection, there is some form of balance between the number of individuals who can detect the bitterness and those who canno
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