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R = can roll tongue; r = can't roll tongue. A couple who both have the ability to roll their tongues have a son who is also a tongue-roller. The son is curious about whether he is homozygous or heterozygous for the tongue-rolling trait. How could he find out? A) He will have to wait to have grandchildren before the question can be answered.B) Have children with a woman who is also a tongue-roller. If all their children are non-rollers, then he is a heterozygote.C) Have children with a woman who is also a tongue-roller. If their children are tongue-rollers, then he is homozygous dominant.D) Have children with a woman who is a non-roller. If any of their children are tongue-rollers, then he is homozygous recessive.E) Have children with a woman who is a non-roller. If any of their children are non-rollers, then he is a heterozygote.

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