Tongue scrolling is the ability to roll the lateral side of the tongue up into the tube. The intrinsic muscles of the tongue allow some people to form their tongues into certain forms. Popular belief states that variations in this ability are the result of genetic inheritance. The flowing of the tongue into tubular form is often described as a dominant trait with Mendel's simple inheritance, and it is usually referred to in introductory biology courses.
There is little laboratory evidence to support the hypothesis that tongue scrolling is a heritable and dominant trait. In 1940, Alfred Sturtevant observed that ~ 70% of people of European descent could roll their tongues and the remaining ~ 30% can not do it. A twin study in 1975 found that identical twins were no more likely than fraternal twins to both have the same phenotype for tongue scavenging.
Cloverleaf's tongue is the ability to fold the tongue in a particular configuration with a few twists. To what extent is genetic, it may be a different dominant trait of tongue rolling.
Video Tongue rolling
See also
- Tongue shape
- A list of properties previously believed by Mendelian to humans
Maps Tongue rolling
References
External links
- OMIM - Tongue Curling, Fold, Or Scrolling
Source of the article : Wikipedia
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