Researchers at Edinburgh University claim to have found that genes play a greater role in determining key personality traits like social skills and learning ability than the way people are brought up by their parents.
For their study, the researchers analysed more than 800 sets of identical and non-identical twins to learn whether genetics or upbringing has a greater effect on how successful people are in life, 'The Daily Telegraph' reported.
Twins are useful in such studies because almost all twins share the same home environment as each other, but only identical twins share exactly the same genetics.
The subjects were asked a series of questions about how they perceive themselves and others, like "are you influenced by people with strong opinions?" By applying their answers to a psychological scale, the researchers assessed as well as categorised different personality traits for each person.
They found that identical twins were twice as likely as non-identical twins to share the same personality traits, suggesting that their DNA was having the greatest impact. (MORE)