Naked Science Forum
Life Sciences => Physiology & Medicine => Topic started by: Atomic-S on 08/02/2017 04:42:10
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Are there any available studies that illuminate the correlation, if any, between the rate of occurrence of transgenderism and various risk factors, such as race, income level, availability of medical care, prevalence of infectious diseases, etc.? Keep in mind that it is also necessary to inquire into not only the environments of the individuals being studied, but also of their biological parents, inasmuch as we are dealing here with something which by its very nature involves reproduction. And a look at caregivers who are not the biological parents is probably also necessary, to ascertain if there might be any influence that is not simply biological.
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Genetics / pre-natal environment, rather than subsequent parenting ... https://wikipedia.org/wiki/Causes_of_transsexuality
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The cited reference says "A twin study found that 33% of pairs of identical twins were both trans, compared to only 2.6% of non-identical twins who were raised in the same family at the same time, but were not genetically identical." (I assume that this means that 33% or 2.6% of pairs such that at least one member of the pair was trans, not 33% or 2.6% of all twins in the general population.) Puzzlingly, however, if 33% of the studied twins were both trans, than in 67% of the studied pair of identical twins, one was not. Inasmuch as identical twins are supposedly genetically identical, and inasmuch as both were gestated under apparently the same conditions, that discrepancy is hard to understand.
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I wonder if the phenomena described in the cited article have ever been observed in any other primate species.