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Gender identities Sexual identities Sexual diversities. Science News. Whether genetic or other physiological determinants form the basis of sexual orientation is a highly politicized issue. Monoamniotic twins share a hormonal environment, but can suffer from the 'twin to twin transfusion syndrome' in which one twin is "relatively stuffed with blood and the other exsanguinated". Microbes from farms may protect children from asthma even in cities Everything you need to know about the hospital food listeria outbreak Our galaxy's central black hole is oddly quiet — now we may know why Who should pay when medical drugs become too expensive to buy? In addition to sex chromosomal contribution, a potential autosomal genetic contribution to the development of homosexual orientation has also been suggested.

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In this way, our gender identity the conviction of belonging to the male or female gender and sexual orientation are programmed or organized into our brain structures when we are still in the womb.

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Female relatives of the homosexual men tended to have more offspring than those of the heterosexual men. A conceptual analysis and quantitative review". Circadian Clocks:

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