Cleft chin

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Image:Mckinley.jpg
The cleft chin of American President William McKinley.

This is an inherited trait in humans, where the dominant gene causes the cleft chin while the homozygous recessive geneotype presents without a cleft. However, it is also a classic example for variable penetrance[1] with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype.

[edit] See also

[edit] References

  1. ^ Starr, Barry. Ask a Geneticist. Understanding Genetics. TheTech. Retrieved on 2007-07-01.
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