The science behind the controversial genetic research into the so-called “gay gene” is the focus of this program. A geneticist explains how the study was carried out, from initial interviews with gay men and their families, to the plotting of family trees, the extraction of DNA, and the analysis of samples in the lab. The program also considers the findings of the research: that homosexuality is, in part, genetically determined. It discusses whether these finds will advance the cause of gay rights and promote tolerance and understanding in society at large. Produced by the Open University. (30 minutes)