The intelligence of fraternal twins reared together correlate almost:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 0.60
The intelligence of fraternal twins reared together correlates almost 0.60. The other figures belong to the other pairs in the same evidence on heredity: identical twins reared together correlate almost 0.90, identical twins reared in different environments 0.72, and brothers and sisters reared together about 0.50. The closer two people are genetically, the higher the correlation.
NCERT (2025-26): “Intelligence: Interplay of Nature and Nurture … The evidence for hereditary influences on intelligence comes mainly from studies on twins and adopted children. The intelligence of identical twins reared together correlate almost 0.90. Twins separated early in childhood also show considerable similarity in their intellectual, personality and behavioural characteristics. The intelligence of identical twins reared in different environments correlate 0.72, those of fraternal twins reared together correlate almost 0.60, and those of brothers and sisters reared together correlate about 0.50, while siblings reared apart correlate about 0.25.…” |