In humans, the ability or inability to roll the tongue is a single gene trait. The allele for tongue rolling (R) is dominant to the allele for not being able to roll the tongue (r). Whether or not an individual can taste PTC is also an single gene trait. The allele for being a taster (T) is dominants to the allele for not being able to taste PTC (t).
Claudia cannot roll her tongue but can taste PTC. Her mom also can taste PTC but her dad is not a taster. Claudia's grandparents were all unable to roll tongues.
1) Based on the Info, what is Claudia's GENOTYPE?
I know she is "rr" because she cannot roll her tongue and it is recessive. However; I do not know the complete genotype for the PTC taster. I know it for sure is a "T," but is it "TT" or "Tt?" How do we know? Do we have enough info to figure it out?