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Blue-eyed Humans Have A Single, Common Ancestor
ScienceDaily (Jan. 31, 2008) — New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today.
The mutation of brown eyes to blue represents neither a positive nor a negative mutation. It is one of several mutations such as hair colour, baldness, freckles and beauty spots, which neither increases nor reduces a human’s chance of survival. As Professor Eiberg says, “it simply shows that nature is constantly shuffling the human genome, creating a genetic cocktail of human chromosomes and trying out different changes as it does so.”
Originally posted by BBTBE
What about people with one blue and one brown or green eye? Surely this disproves this theory?
What is the genetic mutation
“Originally, we all had brown eyes”, said Professor Eiberg from the Department of Cellular and Molecular Medicine. “But a genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a “switch”, which literally “turned off” the ability to produce brown eyes”. The OCA2 gene codes for the so-called P protein, which is involved in the production of melanin, the pigment that gives colour to our hair, eyes and skin. The “switch”, which is located in the gene adjacent to OCA2 does not, however, turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris – effectively “diluting” brown eyes to blue. The switch’s effect on OCA2 is very specific therefore. If the OCA2 gene had been completely destroyed or turned off, human beings would be without melanin in their hair, eyes or skin colour – a condition known as albinism.
Originally posted by IvanZana
What the heck happened on earth around 10,500 b.c?
New research shows that people with blue eyes have a single, common ancestor.
Originally posted by spearhead
i'm one of 8 children. both my parents had brown eyes.
this is how we all popped out in colored order:-
a pattern? yes i think so.
i found my brothers and sisters with blue eyes are less connected to the world emotionly and more connected in a realistic way and vice versa.
people with brown eyes, i've found are at the emotional extremes or ends of the line. like either empathetic or completely lacking empathy.
where people with blue eyes are more down to earth, concerned more with themselves or the state of their environment.
just a observation.