Study: Choosing friends limited by biology

January 17, 2011 4:09:34 PM PST
New research from the National Academy of Sciences suggests the friends we choose may be limited by our biology.

Researchers mapped out friendship networks of more than 9,000 looking for genetic signatures of six genes known to affect human behavior. They found people with genetic markers with a gene associated with alcoholism, tend to cluster together.

They also found those with markers for a gene associated with an open personality-- tended to avoid one another.