When comparing samples of middle-class and impoverished twins, researchers have found that
A) Genes influence behaviour more greatly in the impoverished samples
B) About 50% of the variation in middle-class twins was due to random chance
C) Genes accounted for less than 10% of the IQ differences among impoverished twins
D) Less than 40% of the IQ differences in middle-class twins was accounted for by genes

Question

Quizplus · Accepted Answer

The statement "Genes accounted for less than 10% of the IQ differences among impoverished twins" is the only option that accurately describes the findings of the research comparing middle-class and impoverished twins. Option A is incorrect because the study actually found that genes have a stronger influence on behaviour in middle-class twins. Option B is incorrect because it suggests that chance plays a larger role in middle-class twins, which is not supported by the study. Option D is also incorrect because it suggests that genes play a smaller role in middle-class twins, when in fact the study found that genes have a stronger influence on behaviour in middle-class twins.

When Comparing Samples of Middle-Class and Impoverished Twins, Researchers Have