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Phenylthiocarbamide (PTC) taste sensitivity is a genetically determined trait in humans that reveals the ability or inability to taste a bitter compound known as PTC. This variation is primarily governed by a single gene, *TAS2R38*, located on chromosome 7. Individuals inherit two alleles of this gene—either the dominant “taster” allele or the recessive “non-taster” allele. Those with at least one dominant allele (TT or Tt) can taste PTC as extremely bitter, while individuals with the homozygous recessive genotype (tt) cannot perceive its bitterness. PTC tasting is an example of Mendelian inheritance and serves as a classic case study in population genetics and gene frequency analysis. The sensitivity to PTC also shows _____ ________ __________ ___ ____ _____.
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