Blue eyes are unusual among the human species. Today we reveal some curious facts about this color of eyes.
All blue-eyed people can have a common ancestor
According to Copenhagen University, a single person's genetic mutation in Europe some 6000 to 10000 years ago was the cause of the development of blue eyes in the human species.
According to Hans Eiberg, professor of cellular and molecular medicine at the University of Copenhagen and main author of the study, originally the human being had only one eye colour: brown. However, a mutation in the OCA2 gene resulted in a deviation which, according to Professor Eiberg, "deactivated" the ability to produce the brown colour in the eyes.
Eye colour depends solely on the amount of melanin in the iris of the eye. But the mutation we talked about limited the production of melanin in the iris, which literally diluted the brown color. Those with blue eyes have significantly less melanin in their eyes than those with brown, light brown or green eyes.
From this scientific discovery it was possible to conclude that blue-eyed individuals are all linked to the same ancestor. Because they have all, in one way or another, inherited this genetic mutation.
Now, the reader can ask the following question: If the change in eye colour is the result of the genetic mutation of one individual, how did it spread to about 20% to 40% of the population in some countries of Europe?
A curious theory tells us that this eye colour was immediately considered more attractive. Leading people to seek partners with blue eyes for reproductive purposes. In this way, mutation has multiplied throughout Europe.
Blue eyes have no blue pigment
As we mentioned earlier, melanin is the substance that controls the blue colour in our eyes. Melanin is a brown pigment that, in addition to the colour of the eyes, controls the colour of our hair and skin. In any of these physical features we mentioned, the rule is as follows: the less melanin, the lighter the colour of these physical features. In the case of eyes, those with brown eyes have higher levels of melanin, and those with blue eyes have the lowest levels.
Good luck with the prediction of your child's eye color!
Our eye color was believed to be a simple genetic trait. That is to say, it would be possible to understand the eye color of the descendants, knowing the eye color of the parents and maybe the grandparents.
But these days, genetics has been able to identify about 16 different genes that can influence the color of our eyes, and not just 2 as previously thought. Besides genetic factors, there is also the anatomical factor of the iris that also influences this process.
Do you want the Real example? Princess Charlotte, the youngest daughter of Prince William (who has blue eyes) and Kate Middelton (who has green eyes), has blue eyes. The brother, Prince George, in turn, has brown eyes.
He may be born with blue eyes, but that doesn't mean he has them for life.
Humans do not have the amount of melanin in their eyes as children. For this reason, some people in babies have blue eyes, but the colour changes as the eyes develop in early childhood and the body produces more melanin in the iris.
If your child is going through this phase of transition, don't worry, it's completely natural.