The concordance rate for gay fraternal twins is more than twice as high as for non-twin brothers, lending support to the idea that ____.
a. environment plays a large role in the development of homosexuality
b. homosexuality is mostly biologically driven
c. being a twin increases one's chance of being homosexual
d. being a twin decreases one's chance of being homosexual
Question 2
The largest twin study to date suggests that for men, genetic factors control between ____ of their sexual orientation.
a. 2 and 7 c. 34 and 39
b. 17 and 22 d. 51 and 56
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