Following a review of family, twin, and adoptee studies, Pillard and Bailey (1998) came to a conclusion as to how much of the variance in sexual orientation is accounted for by genes. How much of the variance does genes account for?

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Pillard and Bailey (1998) concluded that genetic factors account for at least half of the variance in sexual orientation, based on their review of family, twin, and adoptee studies.

Following a Review of Family, Twin, and Adoptee Studies, Pillard