Kendler homosexual study of twins



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For perspective, it is valuable to compare genetic contributions to homosexuality with the question - is a girl genetically compelled to become pregnant at 15? The results of these analyses should be interpreted in the context of low statistical power and the use of a single item to assess the complex phenotype of sexual orientation. For example, do genetic variations contribute to atypical hormonal levels which shape CGT and then does CGT precedes the development of trait sexual orientation? The MZ and DZ twin groups were well matched for sexual orientation, CGT, AGI and most demographic variables except for marital status where MZ twins were significantly more often married compared with DZ twins Zygosity was established using standardized questions about physical similarity and confirmed by multiplex DNA genotyping in cases of uncertainty [44]. E includes phenotypic variation accounted for by non-shared environment and measurement error. DJ BemExotic becomes erotic:
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Genetic and Environmental Influences on Individual Differences in Attitudes Toward Homosexuality: An Australian Twin Study


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Genetic and Environmental Effects on Same-sex Sexual Behavior: A Population Study of Twins in Sweden | SpringerLink


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Adolescents of the U.S. National Longitudinal Lesbian Family Study: Sexual Orientation, Sexual Behavior, and Sexual Risk Exposure

One of the pioneers of behavioral genetics and one of the first researchers to use twins to study the effect of genes on traits, including sexual orientation, was psychiatrist Franz Josef Kallmann. Conservatives tend to believe that sexual orientation is actually sexual preference, which is chosen by the individual. Committee on Professional Practice and Standards, APA Board of Professional Affairs". Journal of Genetics, 59 , 29—
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