Dark Skin Blonde Hair
One of my favorite things to do is to learn. I love to read and investigate about art, history, culture and science. One of this days I saw a picture of a dark skin girl with super blonde hair. I started wondering about this, so I made a research on the internet to find out more about this.
Solomon Islands, a country in the southwestern Pacific Ocean. Residents of the Solomon Islands have some of the darkest skin seen outside of Africa. They also have the highest rate of blond hair seen in any population outside of Europe. Now, researchers have found the single gene that explains these fair tresses.
A single mutation is responsible for almost half of the variation in Solomon Islanders' hair color. Most strikingly, this gene mutation seems to have arisen in the Pacific, not been brought in by fair-haired Europeans intermarrying with islanders.
The researchers collected saliva from 43 blond and 42 dark-haired Solomon Islanders to analyze for clues to the genes behind their hair color. A genome-wide analysis turned up a shockingly clear result, rare in the world of genetics where a single trait can be influenced by dozens or more genes. A gene called TYRP1, which resides on the ninth chromosome of human's 23 pairs of chromosomes, explained 46.4 percent of the variation in the islanders' hair color. (Chromosomes are coiled packets of DNA.) A mutation in this gene affects an enzyme known to be involved in human pigmentation, the researchers found.
This mutation doesn't appear in European genomes, an analysis of genomes from 52 human populations around the world revealed. Rather, it seems to have arisen independently and persisted in the Melanesian population.