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Cambridge University Press. The Psychobiology of Sex Orientation 2nd ed. In addition to sex chromosomal contribution, a potential autosomal genetic contribution to the development of homosexual orientation has also been suggested. By way of analogy, the allele a particular version of a gene which causes sickle-cell anemia when two copies are present, also confers resistance to malaria with a lesser form of anemia when one copy is present this is called heterozygous advantage. Elsevier Health Sciences.

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Michael; Martin, Eden R.

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Bem sought support from published literature but did not present new data testing his theory. Gut Microbes Eat Our Medication. Others will prefer activities that are typical of another gender. Some researchers say this is partly because women who have sex with women tend to be more fluid in their sexual orientation.

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On top of these observations, studies in molecular genetics have shown that Xq28, a region located at the tip of the X chromosome, is involved in both the expression of anxiety and male androphilia.

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