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

-Which of the following is a correct interpretation of the data in the graph?
A) The higher the percentage of shared genes between people, the higher the correlations in their IQ scores are.
B) Parents and their adoptive offspring have very similar IQ scores.
C) Siblings reared together have very similar IQ scores, but identical twins do not.
D) The heritability of IQ scores is about 0.90.

Question

Use the following to answer questions :
Refer to the table below.
 
-Which of the following is a correct interpretation of the data in the graph?
A) The higher the percentage of shared genes between people, the higher the correlations in their IQ scores are. 
B) Parents and their adoptive offspring have very similar IQ scores. 
C) Siblings reared together have very similar IQ scores, but identical twins do not. 
D) The heritability of IQ scores is about 0.90.

Quizplus · Accepted Answer

The correct interpretation is that there is a positive correlation between the percentage of shared genes and the similarity in IQ scores. This is typically shown in studies comparing IQ correlations among different types of relatives, with identical twins (who share nearly 100% of their genes) often showing the highest correlation, followed by siblings and parents-offspring (who share approximately 50% of their genes), and so on. This pattern supports the idea that genetics plays a significant role in determining IQ. Choices B, C, and D misinterpret common findings from such studies.

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