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
Ron Baker, Ph.D.
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Update: June 2012