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Name: Noemi
Status: Student
Grade:  9-12
Location: CA
Country: United States
Date: January 2005

Are birthmarks cause by dominant traits or recessive?

In the case of hemangiomas (blood vessel birthmarks), they tend to be caused by a dominant gene, but they can also occur sporadically, meaning they were caused by a newly arising mutation or an accident during embryonic development. Try Googling using "birthmark inheritance" for your search term.

Ron Baker, Ph.D.

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