Study Seeks DNA Clues on Homosexuality

By LINDSEY TANNER, AP Medical Writer, Medicine & Health / Genetics

Mauricio Cabrera poses at his home in Olathe, Kan. on Aug. 28, 2007. Cabrera and his brother, Julio, a student at DePaul Universiity in Chicago, are gay. They are among 1,000 pairs of gay brothers nationwide who are donating blood or saliva to help scientists search for genetic clues about the origins of homosexuality. Both are convinced their sexual orientation is as deeply rooted as their Mexican heritage, and they hope new research will help silence critics who say homosexuality is an immoral choice. (AP Photo/Orlin Wagner)

(AP) -- Julio and Mauricio Cabrera are gay brothers who are convinced their sexual orientation is as deeply rooted as their Mexican ancestry. They are among 1,000 pairs of gay brothers taking part in the largest study to date seeking genes that may influence whether people are gay.

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