Answer: Ability to roll the tongue IS NOT heritable.
Explanation:
This particular point is addressed in Adam Rutherford's book "A Brief History of Everyone Who Ever Lived". (I'm going from memory here so someone can correct me if I've got some details wrong): It was thought for a long time that tongue rolling WAS a heritable trait, but studies of identical twins showed that sometimes one twin can do it, while the other can't, which pretty much puts paid to that hypothesis. Apparently even the guy who first posited (or popularised?) the idea that it was heritable, is now embarrassed when he is told that some science classes still teach that it IS heritable.
As for the other 3 - no idea.
