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Genetics linked to homosexuality in japan

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The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientationthey theorize that a combination of genetic, hormonal, and social factors determine it.

Biological theories for explaining the causes of sexual orientation are favored by scientists [1] and involve a complex interplay of genetic factors, the early uterine environment and brain structure.

A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. Self reported zygositysexual attraction, fantasy and behaviours were assessed by questionnaire Genetics linked to homosexuality in japan zygosity was serologically checked when in doubt.

Other researchers support biological causes for both men and women's sexual orientation. A study of all adult twins in Sweden more than 7, twins [12] found that same-sex behavior was explained by both heritable factors and individual-specific environmental sources such as prenatal environment, experience with illness and trauma, as well as peer groups, and sexual experienceswhile influences of shared-environment variables such as familial environment and social attitudes had a weaker, but significant effect.

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