Use the following to answer questions :
Refer to the table below.

-Which of the following aspects of the data most strongly supports nongenetic influences on IQ scores?
A) The greater correlation of IQ in parent-genetic offspring compared to parent-adoptive offspring
B) The reduced correlation of IQ in MZ twins reared apart compared to those reared together
C) The greater correlation of IQ in DZ twins reared together compared to siblings reared together
D) The reduced correlation of IQ in DZ twins reared together compared to MZ twins reared together

Question

Use the following to answer questions :
Refer to the table below.
 
-Which of the following aspects of the data most strongly supports nongenetic influences on IQ scores?
A) The greater correlation of IQ in parent-genetic offspring compared to parent-adoptive offspring 
B) The reduced correlation of IQ in MZ twins reared apart compared to those reared together 
C) The greater correlation of IQ in DZ twins reared together compared to siblings reared together 
D) The reduced correlation of IQ in DZ twins reared together compared to MZ twins reared together

Quizplus · Accepted Answer

The reduced correlation of IQ in MZ twins reared apart compared to those reared together suggests that environmental factors play a significant role in determining IQ scores. If genetics were the only factor determining IQ, then MZ twins raised in different environments should still have highly correlated scores. However, the fact that their scores are less correlated suggests that environmental factors are also at play.

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