If One Male Identical Twin Is Gay, the Likelihood That

question 88

Multiple Choice

If one male identical twin is gay, the likelihood that the other is also gay is about 50%. By comparison, the likelihood that a gay male's fraternal twin is also gay is closer to 20%. How might a behavioral geneticist interpret these figures

• A)These figures indicate the influence of non-shared environmental factors, thereby suggesting a sizeable genetic contribution to male homosexuality.
• B)These figures indicate the influence of non-shared environmental factors, thereby suggesting a sizeable environmental contribution to male homosexuality.
• C)These figures indicate heritability, thereby suggesting a sizeable genetic contribution to male homosexuality.
• D)These figures indicate heritability, thereby suggesting a sizeable environmental contribution to male homosexuality.

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