The surprising fact behind blue eyes
Blue eyes are loved by people around the world. Blue eyes are associated with both beauty and coldness. It is also known as the eyes of a killer, and a wolfish representation of something cruel or Aryan. Did you ever try to know the reason behind having blue eyes? If not, then continue reading to know about the surprising origin of blue eyes.
A team of researchers from the University of Copenhagen has conducted a study in 2008 to find out the origin of blue eyes. They found out that those who have blue eyes have a common ancestor. The researchers claimed that a genetic mutation that took place between 6000 and 10000 years ago is the main cause of the eye color of all blue-eyed humans living on the planet these days.
2 Genetic mutation
According to Dr. Eiberg, we all had brown eyes originally. But a genetic mutation affected the OCA2 gene in our chromosomes which created a switch that turned off the ability to produce brown-colored eyes. The OCA2 is a gene that codes for P-protein which has a participation in the formation of melanin. Melanin is a pigment responsible for the color of the eyes, hair, and skin. The switch created due to genetic mutation is located in the gene adjacent to OCA2 and does not entirely turn off the gene. It basically reduces the production of melanin in the iris which results in diluting brown eyes to blue.
3 Genetic variation
Now, the question is why only some people have blue eyes? The variation of the eye colors from brown to green is directly proportional to the amount of melanin available in the iris. If the amount of melanin in the iris is high, then the individual is more likely to have brown eyes. All blue-eyed people have variation in a small degree, in the amount of melanin available in their iris, leading to the final conclusion that all blued-eyed people have a common ancestor.
The study of Dr. Eiberg and his team is the latest study in the context of genes. This research started in 1996 when Dr. Eiberg suggested that OCA2 gene is responsible for the color of the eyes.
4 Nature is responsible for shuffling our genes
According to Dr. Eiberg, nature is responsible for shuffling of our genes. He claimed that the genetic mutation of the eyes from brown to blue does not represent a negative and positive mutation. It is similar to other mutations including hair color, baldness, beauty spot, freckles, and none of them affect the chances of survival.
5 Facts about blue eyes
Blue eyes are the second rarest eye color after green and are very common among Israeli people. Countries where you can find most of the blue-eyed people include Germany, Netherland, Scandinavia, Germany, and the Baltic States.