According to Nature vs. Nurture studies, arrange the I.Q. of twins and siblings in order of high to low correlation:
(A) Identical twins reared in different environments
(B) Fraternal twins reared together
(C) Identical twins reared together
(D) Siblings reared apart
(E) Siblings reared together
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (C), (A), (B), (E), (D)
The evidence for hereditary influences on intelligence comes mainly from studies on twins and adopted children. The more alike two people are in heredity and environment, the higher the correlation of their intelligence:
(C) Identical twins reared together — almost 0.90
(A) Identical twins reared in different environments — 0.72
(B) Fraternal twins reared together — almost 0.60
(E) Siblings reared together — about 0.50
(D) Siblings reared apart — about 0.25
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.…” |