More and more people believe that gay sexualy is heredary - but how do this ia f wh natural selectn?
Contents:
- NEW THEORY: THE GAY TRA IS PASSED DOWN FROM PARENT TO CHILD
- MANY GEN INFLUENCE SAME-SEX SEXUALY, NOT A SGLE ‘GAY GENE’
- IS THERE A 'GAY GENE'? REARCHERS THK SO
NEW THEORY: THE GAY TRA IS PASSED DOWN FROM PARENT TO CHILD
For the first time, rearchers have found associatns between homosexualy and markers attached to DNA that n be fluenced by environmental studi and fay tre provi strong evince that sexual orientatn is at least partly geic. The 'epi-marks' n be hered, but n also be altered by environmental factors such as smokg, and are not always shared by intil rearchers llected DNA sampl saliva om 37 pairs of intil tws which only one tw was gay, and 10 pairs which both were gay.
MANY GEN INFLUENCE SAME-SEX SEXUALY, NOT A SGLE ‘GAY GENE’
Ngun says that the rearchers want to replite the study a different group of tws and also terme whether the same marks are more mon gay men than straight men a large and diverse populatn. Pedigree and tw studi dite that homosexualy has substantial herabily both sex, yet nrdance between intil tws is low and molecular studi have failed to fd associated DNA makers. In this mol, homosexualy occurs when stronger-than-average SA-epi-marks (fluencg sexual preference) om an oppose-sex parent pe erasure and are then paired wh a weaker-than-average novo sex-specific epi-marks produced oppose-sex offsprg.
IS THERE A 'GAY GENE'? REARCHERS THK SO
Our mol predicts that homosexualy is part of a wir phenomenon which recently evolved androgen-fluenced tras monly display gonad-tra disrdanc at substantial equency, and that the molecular feature unrlyg most homosexualy is not DNA polymorphism(s), but epi-marks that evolved to nalize sexual dimorphic velopment that sometim rryover across generatns and ntribute to gonad-tra disrdanc oppose-sex scendants. However, blogists have documented homosexual behavr more than 450 speci, argug that same-sex behavr is not an unnatural choice, and may fact play a val role wh populatns.
So-lled genome-wi associatn studi intified a gene lled SLITRK6, which is active a bra regn lled the diencephalon that differs size between people who are homosexual or heterosexual.