Gay male twins over 40
17 Dec "We found 52 percent of identical twin brothers of gay men also were gay, twins and 57 adoptive brothers recruited through advertisements in "This is the first real genetic study of sexual orientation in about 40 years," said.
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Description:Sanders will then use sequences from databases like the Human Genome Project to pinpoint which genes are in these regions. Natural selection opposes anything that might cause even a small reduction in the number of offspring you produce, so a gay trait would soon disappear from the gene pool. When comparing bits of DNA from two brothers, the sequences will, on average, be the same 50 per cent of the time. So what explains the rest?
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