A cleft chin, butt chin, chin cleft, dimple chin or a chin dimple is a dimple on the chin. It is a Y-shaped fissure on the chin with an underlying bony peculiarity.[1] The chin fissure follows the fissure in the lower jaw bone resulted from the incomplete fusion of the left and right halves of the jaw during the embryonal and fetal development.[2]
This is an inherited trait in humans, where the dominant gene causes the cleft chin while the recessive genotype presents without a cleft. However, it is also a classic example for variable penetrance[3] with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype.
See also
References
- ^ Online 'Mendelian Inheritance in Man' (OMIM) 119000
- ^ Mammalian Phenotype Browser:Cleft chin
- ^ Starr, Barry. "Ask a Geneticist". Understanding Genetics. TheTech. http://www.thetech.org/genetics/ask.php?id=47. Retrieved 2007-07-01.
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
