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Tongue rolling is the ability to roll the lateral edges of the tongue upwards into a tube. The tongue's intrinsic muscles allow some people to form their tongues into specific shapes. Rolling the tongue into a tube shape is often described as a dominant trait with simple Mendelian inheritance , and it is commonly referenced in introductory and ...
Previous studies say that between 65 and 81 percent of people can roll their tongue and that the rest have poor genetics. Skip to main content. 24/7 Help. For premium support please call: 800 ...
Estella Poloni also presented the Father Tongue hypothesis at an international conference in Paris in April 2000. [9] On the basis of this population genetic work, historical linguist George van Driem elaborated the Father Tongue hypothesis in his ethnolinguistic publications and in population genetic publications which he has co-authored. [10]
Mendelian traits behave according to the model of monogenic or simple gene inheritance in which one gene corresponds to one trait. Discrete traits (as opposed to continuously varying traits such as height) with simple Mendelian inheritance patterns are relatively rare in nature, and many of the clearest examples in humans cause disorders.
This also strongly points to the ability to produce [r] being learned and not genetic. Finally, the "recessive gene for tongue rolling" has to do with the ability to curl up the sides of the tongue to form a U shape. This ability has nothing to do with the ability to produce [r], which does not involve a U-shaped tongue.
A similar vacuum activity to tongue rolling is 'vacuum chewing' by pigs. In this behaviour, pigs perform all the activities associated with chewing but with no substrate in their mouth. This abnormal behaviour can represent 52–80% of all stereotyped behaviours. [16]
In children, tongue thrusting is common due to immature oral behavior, narrow dental arch, prolonged upper respiratory tract infections, spaces between the teeth (diastema), muscle weakness, malocclusion, abnormal sucking habits, and open mouth posture due to structural abnormalities of genetic origin.
The monogenetic theory points to a single origin of all of the world's languages and it is the most accepted theory. [ 1 ] [ 2 ] It states that all current languages have formed through language change from a single tongue that gradually differentiated into unintelligible languages.