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Scholars have also pointed out that Darwin himself described kin selection in The Origin of Speciesso under a Darwinian model of evolution, not only individuals, but family groups bloodlines can compete for selection. There is enough hate in the world that this concept is not as outrageous as one might think. A child's temperament predisposes the child to prefer certain activities over others. Next, we regressed the contrast of pupil dilation to the same sex or other sex onto sexual orientation. 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.

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He took part in the study with his twin brother.

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A recent review of twin studies indicates that although both genetic variations and the non-shared environment contribute to population-level differences in sexual orientation, the contribution of the non-shared environment is much stronger 1. Bogaert, A. Inresearchers discovered a biological mechanism of gay people who tend to have older brothers. The results for INAH3 weight were similar to those for INAH3 size; that is, the INAH3 weight for the heterosexual male brains was significantly larger than for the heterosexual female brains, while the results for the gay male group were between those of the other two groups but not quite significantly different from either.

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Gringas and Chen describe a number of mechanisms which can lead to differences between monozygotic twinsthe most relevant here being chorionicity and amniocity.

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