Scientists have found that a quarter of mothers who have more than one child is gay, is the activity of X chromosome differently. It would follow that sexual orientation has a genetic basis. After one of the organizers of the study Boklandta Sven (Sven Bocklandt) University of California, sex chromosomes affect gay men. The link between genetics and sexual orientation for ten years, is the subject of heated debate among scientists. In the new study Boklandt and colleagues studied the phenomenon of suppression of the X chromosome, or "sex chromosome inactivation." The study included 97 mothers of gay sons and 103 mothers with a traditional orientation. Scientists have found that mothers with blocked more than one gay son, X chromosomes in almost all cells. According to scientists, this phenomenon has been observed in families with genetic disorders parents. The expert believes that while women have two X chromosomes, one is enough. Therefore one of the chromosomes is permanently suppressed the activity on the other. Boklandt recognized that the findings of these results can not be done, but the specialist believes that he and his colleagues are closer to understanding the origin of sexual orientation.
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