Camperio-ciani homosexuality bedeva seks filimi

“It’s a combination of something on the X chromosome with other genetic factors on the non-sex chromosomes,” he says.

Helen Wallace, of the UK lobby group Gene Watch, welcomes the new research that moves away from the controversial single-gene theory for homosexuality.

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“But it’s worth noting that the data on the sexuality of family members may be unreliable, so more studies are likely to be needed to confirm these findings,” she says.

Even if the maternal factors identified by Camperio-Ciani’s team are linked with male homosexuality, the research team’s calculations suggest they account for only about 14% of the incidence.

 Significantly, the study suggests that mothers and maternal aunts of gay men tend to have significantly more offspring than corresponding relatives of straight men, thus linking female fecundity to male homosexuality.

In effect, this favours the so-called ‘balancing selection hypothesis,’ which attempts to explain why, in evolutionary terms, gay men have not been ‘selected out’ by evolution.

“We have finally solved this paradox,” says Andrea Camperio-Ciani of the University of Padua.

“The same factor that influences sexual orientation in males promotes higher fecundity in females.” Camperio-Ciani’s team questioned 98 gay and 100 straight men about their closest relatives – 4600 people in total.

Male homosexuality is inborn and may be triggered by a gene carried by mothers, new findings suggest.

Evolutionarily speaking, homosexuality as a trait would not last because it discourages reproductive sex with women and therefore procreation.

The findings also suggest that gene led to women who were funnier, happier, more extroverted and more relaxed, leading them to have fewer family problems and social anxieties."If sexually antagonistic genetic factors that induce homosexuality in males exist, the factors might be maintained in the population by contributing to increased fecundity greater reproductive health, extraversion, and a generally relaxed attitude toward family and social values in females of the maternal line of homosexual men," researchers wrote.

Italian geneticists may have explained how genes apparently linked to male homosexuality survive, despite gay men seldom having children.

They found that female relatives of gay men had more children on average than the female relatives of straight men.

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