Darren Griffin gave a skeptical, and widely quoted response to reports out of UCLA where a group of scientists claimed to be able to predict whether a man is attracted to the same or opposite sex by looking at his DNA. Comparing the DNA of 47 sets of male twins, Dr Tuck Ngun said that he identified ‘epigenetic marks’ in nine areas of the human genome which are strongly linked to male homosexuality. Out of the 47 pairs of twins, 37 were pairs where one identified as straight and one as gay, and 10 pairs were both gay. They concluded that it was possible to predict a man’s sexuality with 70 per cent accuracy, just by looking at the epigenetic marks.
In a guarded response that appeared in numerous national and international media however Professor Griffin said “To claim a 70% predictive value of something as complex as homosexuality is bold indeed. I wait with bated breath for a full peer-reviewed article.” The work has largely since been debunked by a number of scientist.