Sunday, January 3, 2010

Sexual orientation not hardwired by DNA

Book Review:

 

The Language of God by Francis S. Collins

Free Press

 

From the chapter

THE MORAL PRACTICE OF SCIENCE AND MEDICINE: BIOETHICS --

 

“An area of particularly strong public interest is the genetic basis of homosexuality. Evidence from twin studies does in fact support the conclusion that heritable factors play a role in male homosexuality. However, the likelihood that the identical twin of a homosexual male will also be gay is about 20 percent (compared with 2-4 percent of males in the general 'population), indicating that sexual orientation is genetically influenced but not hardwired by DNA, and that whatever genes are involved represent predispositions, not predeterminations.”

 

– p.  260

 

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