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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Definitions:

Supply Curve

A graphical representation showing the relationship between the price of a good and the quantity of the good that suppliers are willing to sell.

Demand Curve

A graph showing the relationship between the price of a good and the quantity demanded by consumers.

Market Price

The current price at which an asset or service can be bought or sold in a competitive marketplace.

Consumer Surplus

The difference between the total amount consumers are willing and able to pay for a good or service versus the total amount they actually pay.