In which of the following cases would you expect to find the greatest similarity in IQ?
In which of the following cases would you expect to find the greatest similarity in IQ?
Options:
(a) Between fraternal twins
(b) Between non-twin siblings
(c) Between identical twins
(d) Between parent and child
✅ Correct Option: (c) Between identical twins
Explanation:
IQ has a strong genetic component, and studies of twins provide insight into heredity. Identical (monozygotic) twins share 100% of their genes, making them more similar in IQ than fraternal twins, non-twin siblings, or parent-child pairs. Fraternal twins share about 50% of their genes, similar to ordinary siblings. Identical twins reared apart still show significant IQ correlation, highlighting the influence of genetics alongside environment. This concept is frequently tested in PPSC questions on intelligence, heredity, and educational psychology.
10 Related PPSC Facts:
Identical twins = highest genetic similarity IQ influenced by genetics and environment Fraternal twins share ~50% of genes Non-twin siblings = ~50% similarity Parent-child IQ correlation is lower Identical twins reared apart = high IQ correlation Nature vs. nurture debate Supports heredity in intelligence Important in educational psychology Frequently asked in PPSC pedagogy