Tongue-rolling: The myth. Some people can roll their tongue into a tube, and some people can’t. This is one of the most common traits that biology teachers use to demonstrate basic genetic principles. Alfred Sturtevant (one of the pioneers of Drosophila genetics (http://en.wikipedia.org/wiki/Alfred_Sturtevant)) described tongue rolling as a simple two-allele character, with the allele for rolling (usually given the symbol T or R) being dominant over the allele for non-rolling (t or r) (Sturtevan