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Kendler homosexual study of twins

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Two women exchange rings during their wedding ceremony in this file photo taken on Aug. The largest study of its kind found new evidence that genes contribute to same-sex sexual behavior, but it echoes research that says there are no specific genes that make people gay. The genome-wide research on DNA from nearly half a million U. The variants were more common in people who reported ever having had a same-sex sexual partner. That includes people whose partners were exclusively of the same sex and those who mostly reported heterosexual behavior.
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Straight And Gay Identical Twins Could Help Us Learn Where Sexuality Comes From

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Straight And Gay Identical Twins Could Help Us Learn Where Sexuality Comes From

CHICAGO AP — The largest study of its kind found new evidence that genes contribute to same-sex sexual behavior, but it echoes research that says there are no specific genes that make people gay. The genome-wide research on DNA from nearly half a million U. The variants were more common in people who reported ever having had a same-sex sexual partner. That includes people whose partners were exclusively of the same sex and those who mostly reported heterosexual behavior. The study was released Thursday by the journal Science. Results are based on genetic testing and survey responses. Some of the genetic variants found were present in both men and women.
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What Twin Studies Tell Us about Homosexuality: Nature vs. Nurture

The relationship between the environment and sexual orientation is a subject of research. In the study of sexual orientation , some researchers distinguish environmental influences from hormonal influences, [1] while other researchers include biological influences such as prenatal hormones as part of environmental influences. Scientists do not know the exact cause of sexual orientation, but they theorize that it is the result of a complex interplay of genetic , hormonal , and environmental influences.
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Behavior Genetics. Multivariate structural equation modeling techniques have been applied to examine the causes of individual differences in responses to several items concerning sexual orientation. The statistical power of the analysis was increased by the availability of multiple measures of sexual orientation behaviors, attitudes and feelings , providing stronger evidence for the existence of additive genetic influences on this phenotype than in a previous analysis Bailey et al. Unable to display preview.
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