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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 ...
You probably think that if you can't roll your tongue, it's because of genetics -- but that's not true. Previous studies say that between 65 and 81 percent of people can roll their tongue and that ...
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.
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]
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.
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.
Medical genetics is the application of genetics to medical care. It overlaps human genetics, for example, research on the causes and inheritance of genetic disorders would be considered within both human genetics and medical genetics, while the diagnosis, management, and counseling of individuals with genetic disorders would be considered part ...
The Proto-Human language, also known as Proto-Sapiens or Proto-World, is the hypothetical direct genetic predecessor of all human languages. [1]The concept is speculative and not amenable to analysis in historical linguistics.