Top actors Aishwarya Rai and Angelina Jolie may have common ancestors.
If a research is to be believed, all people with blue eyes can trace their ancestry back to one person, who probably lived about 10,000 years ago in the Black Sea region.
Scientists studying the genetics of eye colour at the University of Copenhagen found that more than 99.5 per cent of blue-eyed people, who volunteered to have their DNA analysed, have the same tiny mutation in the gene that determines the colour of the iris.
Professor Hans Eiberg of the university said he has analysed the DNA of over 800 people with blue eyes, ranging from fair-skinned, blond-haired Scandinavians to dark-skinned, blue-eyed people living in Turkey and Jordan.
"All of them, apart from possibly one exception, had exactly the same DNA sequence in the region of the OCA2 gene. This indicates very strongly that there must have been a single, common ancestor of all these people," he said.
The study reported in the journal Human Genetics indicates that the mutation originated in just one person who became the ancestor of all subsequent people in the world with blue eyes.
"From this, we can conclude that all blue-eyed individuals are linked to the same ancestor. They have all inherited the same switch at exactly the same spot in their DNA," Professor Eiberg was quoted as saying by The Independent daily.
Even though the scientists are unable to pinpoint the exact date of the mutation, evidence suggests that it probably arose about 10,000 years ago, when there was a rapid expansion of human population in Europe as a result of the spread of agriculture from the Middle East.
