The Fact That the Rate of Homosexual Concordance Is Substantially

question 25

Multiple Choice

The fact that the rate of homosexual concordance is substantially higher for identical twins than for nonidentical twins argues in favor of a genetic contribution to sexual orientation.Why does this finding also show us that genetic factors are not the sole determinants of sexual determinants?

• A)If the genetic factors were acting in isolation,then the rates of concordance should be higher for nonidentical twins than for identical twins.
• B)If the genetic factors were acting in isolation,then the rates of concordance should include adopted siblings as well as cotwins.
• C)If genetic factors were the only determinants involved,then the rate of concordance would be 50 percent.
• D)If genetic factors were the only determinants involved,then the rate of concordance would be 100 percent.

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Definitions:

Null Hypothesis

A default hypothesis that there is no significant difference or effect, tested against the alternative hypothesis.

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis; it depends on the chosen level of significance.

Test Statistic

A standardized value used in hypothesis testing to determine how far a sample statistic diverges from what is assumed in the null hypothesis.

Sample Evidence

Data collected from a sample that is used to make inferences or conclusions about a larger population.