You have your father’s nose and your mother’s fair complexion.
So, whose sunny — or sullen — disposition did you receive?
By studying nearly 1,000 pairs of twins, British and Australian researchers say they've found that genes control half the personality traits that make a person happy, Reuters reports.
The twins — both identical and fraternal — ranged in age from 25 to 75.
The other half of your personality is controlled by factors such as relationships, careers and health, the researchers said.
"What this study showed was that the identical twins in a family were very similar in personality and in well-being, and by contrast, the fraternal twins were only around half as similar," said study leader Tim Bates, a researcher at the University of Edinburgh in England. "That strongly implicates genes."