Gene That Determines Skin Color Is Discovered, Scientists Report
The gene comes in two versions, one of which is found in 99 percent of Europeans and the other in 93 to 100 percent of Africans, the researchers report in today's issue of Science.
The new gene falls into the same category as the Duffy gene, and it may shed light on the evolutionary pressures to which Europeans were subjected as their ancestors, who were presumably dark skinned, moved into the northern latitudes some 40,000 years ago.
Humans acquired dark skins in Africa about 1.5 million years ago to shield their newly hairless bodies from the sun. Its ultra-violet rays destroy folic acid, a shortage of which leads to birth defects.
But when the modern humans who left Africa began to live in northern latitudes, they needed more sunlight to penetrate the skin, to permit the chemical reaction that produces vitamin D.
comments powered by Disqus
- Yemen museum destroyed
- Viking beaters: Scots and Irish may have settled Iceland a century before Norsemen
- Secret diary of a top Soviet official shows the leadership was in turmoil 15 years before the USSR’s demise
- New History Dispute Splits U.S. Allies in Asia
- New exhibit at the Hirshhorn Museum focuses on Iranian history
- William Leuchtenburg says historians and the media have been too hard on Obama
- Hugh Ambrose, historian who helped develop WWII Museum, dead at 48
- Historian discounts claim that Churchill and other British PM's were gay
- Nick Bunker Wins $50,000 2015 George Washington Book Prize
- Niall Ferguson Vs. Robert Skidelsky