Me with this genetics problem, i will reward 91 points. : 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 a father 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.