About 70% of Canadians get a bitter taste from the chemical phenyl thiocarbamide

About 70% of Canadians get a bitter
taste from the chemical phenyl thiocarbamide (PTC) while the other 30% do not.
The ability to taste this chemical (T) is a dominant characteristic while
taste-blindness to it is recessive (t). Tongue-rolling ability is dominant (R)
while the inability to roll the tongue is recessive (r). A tongue-rolling woman
who is taste-blind for PTC has afather who could not roll his tongue
but could taste the PTC chemical. She marries a man who can taste PTC but
cannot roll his tongue. His mother was taste-blind to the chemical. Show the
possible children this couple could produce. Use a Punnett square to illustrate
your answer.