alleryWhich pair shows the lowest intelligence correlation?
AIdentical twins reared apart
BFraternal twins together
CSiblings reared apart
DSiblings reared together
Answer & Solution
Correct answer: C. Siblings reared apart
1. The reported correlations are: identical twins together about 0.90, identical twins apart 0.72, fraternal twins together about 0.60, siblings together about 0.50, siblings apart about 0.25.
2. Siblings reared apart share only some genes and different environments.
3. So they show the lowest correlation, about 0.25.
_Source: NCERT Class XII Psychology, Ch 1 Variations in Psychological Attributes, "Intelligence: Interplay of Nature and Nurture", p. 9_
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