Tongue rolling

Sublingual rollers is the ability of most of the human population understood to roll the tube-like tongue of high curvature of the lateral edges. The proportion of the tongue roller in the population is 65-81 %, wherein the content is slightly higher in women than in men.

The tongue rolls was long erroneously as an example of dominant inheritance in Mendelian sense. However, it was already evident in studies 1940 ( Sturtevant ) and 1951 ( Komai ), the one that can also develop children of " scooters " to " Non- scooters ", and that the other children of "non scooters " can become " scooters ". In addition, twin studies showed Matlock (1951 ) that even identical twins can have different capabilities of tongue rolling.

Not all " Roller" master of the tongue rolls of birth. In studies of Komai (1951 ) was able to roll the tongue at an age of seven years, with 54 per cent majority of the investigated scooter and non scooter, another 22 percent learned it then up to the age of twelve years.

The tongue rolls proves to be a complex acquired property that is determined both by multiple genes as well as by environmental conditions. A clear assignment of a lineage is not possible on the tongue rolls, in particular it can not serve as evidence in a process of elimination for a paternity tests also.