A gene controls muscle formation in the tongue that allow people with those muscles to roll their tongues. People who lack those muscles cannot tongue roll. The ability to roll one’s tongue is dominant over non-rolling.
Suppose a woman who is a homozygous tongue-roller marries a man who is heterozygous for tongue-rolling.
Let T represent tongue-rolling, t represent a non-roller
What is the predicted phenotypic percentage of tongue-rolling among their children?