CNN If you're a guy with an older brother, there's an increased chance you're gay. A previous version of this story referred to higher concentrations of the protein instead of higher concentrations of antibodies to the proteins when describing the findings of the study.
Stars Screen Binge Culture Media. Tech Innovate Gadget Mission: Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Homosexual statistics number of partners brothers science of sexuality Story highlights Scientists say Homosexual statistics number of partners brothers who have more than Homosexual statistics number of partners brothers boy had higher concentrations of a certain protein Earlier studies have noticed that gay men often have older brothers.
Scientists have noticed this
Homosexual statistics number of partners brothers in previous research, but now they think they have a biological explanation as to why, and it starts long Homosexual statistics number of partners brothers birth. The researchers say that if their findings can be replicated, we may know at least one of the biological reasons some men are gay.
Many factors may determine someone's sexual orientation, but in this case, researchers noticed a pattern that may be linked to something that happens in the Homosexual statistics number of partners brothers. The phenomenon is related to a protein linked to the Y chromosome which women do not have that is important to male brain development. Researchers think it's possible that when a woman gets pregnant with her first boy, this Y-linked protein gets into her bloodstream.
The mother's body recognizes the protein as a foreign substance, and her immune system respondscreating antibodies. If enough of these antibodies build up in the woman's body and she gets pregnant with another a boy, they can cross the placental barrier enter the brain of the second male fetus.
Earlier research has shown that the more older brothers a boy has, the more of a chance that boy will be attracted to men. A study showed that with each brother, the chance that a man will be gay goes up by about a third, but the researchers didn't determine why that was.
Bogaert and his co-authors tested a small group of women and 12 men ages 18 to 80 and found a higher concentration of antibodies to the protein, known as NLGN4Yin blood samples from women than from men. They found the highest concentration of antibodies to the protein in women with gay younger sons who had older brothers, compared with women who had no sons or who had given birth to only heterosexual boys. Sun,
Homosexual statistics number of partners brothers and sculpted timber: How architecture shaped Fire Island Pines.
The study builds on research Bogaert and his co-authors have been exploring for more than 20 years. Since their initial research that noted the trend, other research -- although not all studies -- have detected the phenomenon, even across cultures. One found that a man's chances of being gay increased even if he was raised apart from his older brother.
Researchers did not see a similar pattern in families with adopted Homosexual statistics number of partners brothersso scientists started to think there must be a maternal developmental Homosexual statistics number of partners brothers. The research does not give a biological explanation for why some men may be bisexual may not be attracted to anyone at all, nor can it give a biological explanation for gay only childrengay oldest sons or Homosexual statistics number of partners brothers who are attracted to women.
Michael Baileya professor in the Department of Psychology at Northwestern University, thinks the latest research is important.
Bailey was not involved in the new study but has worked on studies that have found genetic factors that may explain some differences in sexual orientations.
Bailey's latest paper, published this month in the journal Nature Research, looked at people's genomes and found several regions with single-letter DNA changes that were more common among gay men than straight men and may be relevant to the development of sexual orientation. Bailey believes this new study may even more significant than general genetic findings if the findings can be replicated.
This is important work and fascinating if it proves to be true.
Would you date someone you really didn't find attractive?Estimates of the population numbers and measures of quality (to show the Males are more likely to identify as gay, lesbian or bisexual than females . In , of the LGB population % were in a civil partnership or a. More and more people believe that gay sexuality is hereditary - but how having a homosexual orientation boosts siblings' reproduction rate, but Many of the " straight" men who have sex with fa'afafine in Samoa go on to..
CNN If you're a guy with an older brother, there's an increased chance you're gay. A previous version of this story referred to higher concentrations of the protein instead of higher concentrations of antibodies to the proteins when describing the findings of the study. Stars Screen Binge Culture Media. Tech Innovate Gadget Mission: Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. The science of sexuality
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A genetic criticism of gay siblings supports the design that genes on the X chromosome contribute to male homosexuality. Dean Hamer finally feels vindicated. But several later studies whooped his decision into pump. Now the largest nonconformist replication venture so distant, looking at pairs of gay brothers, fingers the same territory on the X.
But not all and sundry finds the results convincing. And the kind of DNA division used, known as a genetic linkage study, has largely superannuated superseded past other techniques.
Due to the limitations of that approach, the new fashion also fails to lend what behavioral geneticists indeed crave:
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