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?

TT

Tt

tt

There is not enough information provided to be able to tell the individual's genotype.

Answer 1

Answer- TT

Explanation- The recessive allele for the ability to taste PTC (Phenylthiocarbamide) is designated by 't'. Hence, the person with genotype 'tt' get the taste of PTC as nothing. So, the disease is an example of autosomal recessive inheritance. The heterozygous genotype 'Tt' gives the mild bitter taste as there is a 't' allele. The genotype TT will represent extreme bitter taste. The dominant allele 'T' attributes the extreme bitter taste in genotype TT.

So, answer is TT.