Many traits can be inherited from your parents; the ability to taste a chemical

Question

Many traits can be inherited from your parents; the ability to taste a chemical called PTC is no exception. When you try it, you may have an extreme bitter taste in your mouth, mildly bitter, or you may taste nothing at all. Your genotype is what determines this outcome. The ability to taste PTC is dominant (T) to the alleles for nontasting which are recessive (t). If a student walks into class and is told to try PTC and then complains about an extremely bitter taste, what is most likely their genotype?

Explanation / Answer

Individuals with dominant allele T only will able to taste bitterness of PTC. The allele T is dominant and is inherited from parents to offspring. The genotypes TT and Tt result in tasting bitterness of PTC. Since, allele T is dominant and masks the recessive allele 't', the heterozygous genotype Tt also results in bitter taste of PTC along with genotype TT. Therefore, options 1 and 2 are correct.

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