Did you know that the second most common eye color worldwide is blue? Almost 10 percent of people are known to have blue eyes. Most people with blue eyes are generally of European origin, but it is known that black people are also born with blue eyes, although it is rare.
For this reason, it is often wondered where the origin of blue-eyed Africans comes from. Of course, there are many different scientific explanations for this situation. For example, a blue eyed african If he has a white relative in his lineage, this can be counted as a reason for his blue eyes.
Or completely a mutation in genes may also cause this condition. In fact, in order to understand this issue, it is necessary to look at the scientific explanation of how blue eyes are formed. Let’s take a look at how scientists have handled this situation.
In fact, humans originally had brown eyes, so blue eyes were the result of a genetic mutation.
In the research conducted at the University of Copenhagen, 800 blue-eyed male and female individuals from different countries were studied. As a result of the research, blue eyes were probably caused by a genetic mutation that occurred 10,000 years ago. to the same DNA sequence detected as a result. In this context, medical professor Hans Eiberg says that humans are actually brown-eyed, thanks to a genetic mutation that affects the OCA2 (in humans, a protein encoded by the oculocutaneous albinism II gene) gene in the chromosomes.
This mutation ocular albinism it’s called. Some scientists even say that the OCA2 gene, formerly called the P gene, produces a pigment called melanin. Melanin is a substance that gives color to the skin, hair and eyes. Scientists say this gene mutation changes the amount of melanin produced in the iris of the eyes (the vascular region behind the transparent layer in the front of the eye that gives the eye its color) and lowers the concentration at which brown eyes occur, thus producing blue eyes. As you can see, this mutation restricts the ability to produce brown eyes.
Eighty percent of people with blue eyes live in Estonia and the Scandinavian countries.
In fact, although most blue-eyed people live in Europe, according to research by researcher Edmund Custers, all blue-eyed people in the world same gene mutation owner. For this reason, it is possible to talk about the existence of blue-eyed people with a total rate of eighty percent in all of Estonia, Scandinavian countries and African countries.
Waardenburg Syndrome is another cause of blue eyes.
Actually, this syndrome is like ocular albinism. But the only difference in this syndrome is that the eyes are different colors from each other and hearing loss, white hair on the forehead. some symptoms to contain. In addition, Waardenburg Syndrome is a very rare genetic disease.
From the family members on the mother or father’s side having white relatives It’s not enough to be a black person with blue eyes.
the parents’ side of the family, from both Must have white relatives. Because being blue-eyed may not occur immediately in the family tree. This situation may take a few generations to emerge. For example, it did not appear in the grandmother, but the grandchild after the third generation, once you see, has blue eyes. The reason why this happens after generations is the presence of a partially recessive gene.
To explain by giving an example; We get most of our genes from two copies of both genes, one from our mother and one from our father. eye color gene (B) brown version to recessive blue version (b) more dominant than If any of your dominant genes is version B, then you cannot have blue eyes. Because blue will remain recessive compared to brown. If we explain the situation with the genetic part of the job; BB or Bb genes can be activated for brown eyes, but the genes for blue eyes must be bb. In other words, in the ancestors of blue-eyed blacks; Both parents must have the b version of both genes.
Resources: Travel Noire, The Tech
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