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Independent Minds Comments can be posted by members of our membership scheme, Independent Minds. The initial benefit to the parents may explain why the trait of homosexuality persists throughout evolution, he says. Graeme and I just hugged each other. We then conducted a mixed-factorial regression analysis.

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Baby 'twins' have two different fathers after gay couple were both able to fertilise an embryo of a surrogate mother

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Fraternal birth order and male sexual orientation - Wikipedia

For all twins, their average scores were approximately 1, suggesting monozygosity. Bogaert provided a direct test pitting prenatal against postnatal e. Roeder grew up in southern Indiana - near a small town similar to those that appear in his novels. Namespaces Article Talk. The failure of these studies to demonstrate the fraternal birth order effect has been attributed to their methodological flaws. Subscribe now. Help us improve our products.
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Homosexuality May Start in the Womb

Series B, Biological Sciences. Male black widows have an unusual strategy for finding a female By Katie Camero Jul. Suschinsky, K. Statistical analysis with missing data.
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In both studies, the collective findings for older sisters, younger brothers, and younger sisters as well as individual findings for the four sibling classes suggested that mean family size of the homosexual study groups was comparatively smaller to that of the heterosexual groups in both studies. Evolution and Human Behavior. She loaned me the book on March 11th, and I started it that same night. Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample.
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