In which of the following cases is the correlation between IQ scores the LOWEST?
A)Identical twins reared apart
B)Non-twin siblings reared apart
C)Fraternal twins reared together
D)Adoptive siblings reared together

Question

In which of the following cases is the correlation between IQ scores the LOWEST?
A)Identical twins reared apart ​
B)Non-twin siblings reared apart
C)Fraternal twins reared together
D)Adoptive siblings reared together

Quizplus · Accepted Answer

Adoptive siblings reared together share no genetic material but share their environment. The correlation of IQ scores among adoptive siblings is generally lower than that among biological siblings or twins, regardless of whether they are reared together or apart, because IQ has a significant genetic component.

In Which of the Following Cases Is the Correlation Between