A massive study of half a million people finds no single gene behind sexual orientation, adding more evidence that there is no “gay gene” The relationship between biology and sexual orientation is a subject of ongoing research While scientists do not know the exact cause of sexual orientation, they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences [1][2][3] however, evidence is weak for hypotheses that the postnatal social environment impacts sexual orientation, especially for. The study reported that gay brothers showed a higher concordance rate for markers in the xq28 region, leading to the popularization of the “gay gene” concept in media. The team combed the genomes.
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