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This is not my subject so I may be way off here, but isn't sexual orientation something that is determined post-conception. That is there is nothing in the genes in the sperm or unfertilised egg that predetermine the sex of a child,
I was asked today whether there is any evidence for the existence of a "gay gene" ?Your thoughts?Chris
If so, would this tend to indicate that the influencing factors are "post natal"?
It's not obvious to me that two foetuses of significantly different sizes, even if exposed to the same hormonal signals across the placenta, will get the same effect from it
But not necessarily. The experience of twins, even identical twins, even in the womb, can be very different because usually one has a better positioned placenta (or something) than the other. All the pairs of identical twins I've ever known (small sample size, but this is more-or-less a counterexample argument anyway..) had very different birth weights, and as they grew continued to be noticeably different in height and weight at least for several years. It's not obvious to me that two foetuses of significantly different sizes, even if exposed to the same hormonal signals across the placenta, will get the same effect from it (especially with something that is such a broad spectrum as sexuality).
These NewScientist articles might be relevant:...sorry, you cannot view external links. To see them, please
REGISTER or LOGINflies-reveal-how-booze-affects-inhibitions.htmlThe first two describe an experiment where flies were bred with a special temperature-sensitive gene, and the researchers claim the resulting flies flipped between straight and gay behaviour with temperature. Without having seen the detail of the work, I would tend to interpret that this implies there is something chemical/physical going on, pointing away from a 'nuture'-type argument...This research was done 6 years ago now, and I don't know whether it's been repeated and/or taken further (or even disproved) since then.