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.

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"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."

Click here to read the full story from Reuters.