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While some countries are going backwards, there is a greater openness around the world to homosexuality. Whatever the results, Sanders stresses that complex traits such as sexual orientation depend on multiple factors, both environmental and genetic. Imagine parents requesting a genetic test on their unborn fetus, or worse, a government rolling out mandatory testing of all unborn children, and using compulsory abortions to cleanse the gene pool. Genetics and environmental influences seemed logical. Other researchers who have looked at the biological origins of sexual orientation have welcomed the latest findings, saying they help resolve contradictory results from earlier, smaller studies.

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Mariam. Age: 25.
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The latest study involves about three times as many people as the previous largest study, which means it is significantly more statistically robust.

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Jaelynn. Age: 21.
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Over the past five years, Sanders has collected blood and saliva samples from pairs of gay brothers, including non-identical twins, from families. Even if he has hit on individual genes, they will likely only have at most a small effect on their own, as has also been seen in studies of the genetic basis for intelligence, for example. However, it is important that the findings be put in context.

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