This is why we study epigenetics as a possible cause now and not genetics. Perhaps if you made any effort to remain current in your study of this, rather than simply settling for an answer you find satisfactory, you'd be with the rest of us in the 21st Century.
This is indeed the beginning of the disappointment for those who would prefer there to be something responsible and out of their controls to blame their sexuality on rather then just accepting that we are what we are. The clump of genes I refer to is cutting edge technology.
By Sarah Knapton, Science Correspondent11:59PM GMT
13 Feb 2014
Homosexuality is only partly genetic with sexuality mostly based on environmental and social factors, scientists believe.
A study found that, while gay men shared similar genetic make-up,
it only accounted for 40 per cent of the chance of a man being homosexual.
But scientists say it
could still be possible to develop a test to find out if a baby was more likely to be gay.
In the most comprehensive study of its kind, Dr Michael Bailey, of Northwestern University, has been studying 400 sets of twins to determine if some men are genetically predisposed to being gay.
They are testing because they don't know
The study found that gay men shared genetic signatures on part of the X chromosome - Xq28.
The big clump I referred to
Dr Bailey said: “Sexual orientation has nothing to do with choice. Our findings suggest there
may be genes at play – we found evidence for two sets that affect whether a man is gay or straight.
“
But it is not completely determinative; there are certainly other environmental factors involved. “The study shows that there are genes involved in male sexual orientation.
“Although this could one day lead to a pre-natal test for male sexual orientation, it would not be very accurate, as there are other factors that can influence the outcome.”
Dr Alan Sanders, associate
Professor of Psychiatry at Northwestern University, who led the study said that it was it was an 'oversimplification’ to suggest there was a 'gay gene.’
“We don’t think genetics is the whole story. It’s not. We have a gene that contributes to homosexuality but you could say it is linked to heterosexuality. It is the variation.”
The study builds on work by Dr Dean Hamer from the US National Cancer Institute in 1993 who also found an area of the x chromosome that he believed was linked to male sexual orientation.
It is totally Pie in the sky research.
Last year Canadian scientists found that the more older male siblings a man has, the greater change he will be gay.
They believe that the immune response produced by a pregnant mother increases with each son, increasing the odds of producing more feminine traits in the developing brain of the foetus.
Each older brother raised the odds that a man was homosexual by one third.
Researchers at the University of California believe that homosexuality can be explained by the presence of epi-marks — temporary switches that control how our genes are expressed during gestation and after birth .
which is what I said
Daryl Bem, a social psychologist at Cornell University, has suggested that the influence of biological factors on sexual orientation may be mediated by experiences in childhood. A child’s temperament predisposes the child to prefer certain activities over others.
Interestingly no similar genes have been discovered which influence female homosexuality
. In other words, environmental conditioning, which is what I said
“No-body has found something like this in women,” he added.
Dr Bailey said environmental factors were likely to have the biggest impact on homosexuality.
He added: “Don’t confuse “environmental” with “socially acquired.” Environment means anything that is not in our DNA at birth, and that includes a lot of stuff that is not social.”
Richard Lane, of Stonewall, said that while studies into the origins of homosexuality have yet to produce firm evidence, they do to point to a biological root.
http://www.telegraph.co.uk/science/...ly-partly-due-to-gay-gene-research-finds.html
