All Blue-Eyed People Have This One Thing In Common

 
Related

Loyal Dog Jumps on Hospital Bed to Comfort 9-Year-Old Boy With Autism

Puyol Mos
916 points

Watch This Little Boy s Reaction When He Gets To Hold A Puppy

Puyol Mos
1256 points



Most recent

Churro mediamanga y mangotero

Enrique TF
16 points

Gritos anónimos en un desierto de astros indiferentes?

Enrique TF
26 points

RESPUESTAS Y PREGUNTAS: ¿Cuáles son primero?

Enrique TF
36 points

SECTOR DE CAMBIO DE DIVISAS ABRE SUS PUERTAS

Carlos Eduardo Lagos Campos
40 points

Éramos felices y no lo sabíamos

PENSAMIENTO LIBRE
42 points

Piscinas desmontables: ¿cuánto peso soporta la terraza de una vivienda?

MaríaGeek
16 points

IMPORTANCIA DEL SECTOR MINERO EN TIEMPOS DE PANDEMIA

Image Press
12 points

CONCEPTOS SOBRE EL RELATIVISMO ÉTICO Y CULTURAL QUE HOY DOMINAN A LA HUMANIDAD

PENSAMIENTO LIBRE
26 points

Mensaje al Centro de Pensamiento Libre

PENSAMIENTO LIBRE
102 points

Periodista Andrea González-Villablanca finaliza sus estudios en la UNCTAD, Ginebra

ESNOTICIA.COM
14 points
SHARE
TWEET
Every blue-eyed person on the planet is descended from a single European who lived around 6,000 to 10,000 years ago, and who first developed a specific mutation that accounts for the now widespread iris coloration.

All Blue-Eyed People Have This One Thing In Common

Originally, all humans had brown eyes, although genetic variation relating to a gene called OCA2 resulted in changes to the amount of pigment produced by different individuals, resulting in the emergence of different shades of brown. Armed with this information, scientists had for many years searched for the source of blue eyes on the OCA2 gene, but without success.

More recently, a mutation to a separate, nearby gene called HERC2 has been identified as the cause of blue eyes. This alteration switches off OCA2, the gene that determines the amount of the brown pigment melanin that we make. It is thought to have first occurred when humans began to migrate from Africa to Europe, meaning that every person with blue eyes is a descendent of a single early European.

The fact that every blue-eyed person alive today has this same mutation is pretty compelling evidence for this theory, although the identity of the initial mutant remains something of a mystery. To date, the earliest set of sapphire-colored peepers ever found belong to a 7,000-year-old skeleton that was discovered in northern Spain. Naturally, the eyes had long since decayed, however genetic analysis revealed that they would have appeared blue in color.



Fuente: www.iflscience.com
SHARE
TWEET
To comment you must log in with your account or sign up!
Featured content