Study Detects Recent Instance of Human EvolutionBreaking News
The finding is a striking example of a cultural practice — the raising of dairy cattle — feeding back into the human genome. It also seems to be one of the first instances of convergent human evolution to be documented at the genetic level. Convergent evolution refers to two or more populations acquiring the same trait independently.
Throughout most of human history, the ability to digest lactose, the principal sugar of milk, has been switched off after weaning because there is no further need for the lactase enzyme that breaks the sugar apart. But when cattle were first domesticated 9,000 years ago and people later started to consume their milk as well as their meat, natural selection would have favored anyone with a mutation that kept the lactase gene switched on.
Such a mutation is known to have arisen among an early cattle-raising people, the Funnel Beaker culture, which flourished some 5,000 to 6,000 years ago in north-central Europe. People with a persistently active lactase gene have no problem digesting milk and are said to be lactose tolerant.
comments powered by Disqus
DeWayne Edward Benson - 12/12/2006
Evelution can be cause of many things, as this old Christian has discovered.
I worked all during my lifetime, as a result calluses evolved on the palms of my hands.
I also have evolved a wart, but I blame this on my environment. Some call it a blemish, but I call it damage of DNA at the cellular level. Thankfully it was not passed along to the children.
- Rubio Surges Into Second In New Hampshire
- Branstad Says Cruz Ran ‘Unethical’ Campaign
- Christie Highlights Santorum’s Endorsement of Rubio
- Portman Comes Out Against Trade Deal
- Megyn Kelly Gets a Book Deal
- A Big List of the Bad Things Clinton Has Done
- An Unambiguous Sign Sanders Won Last Night’s Debate
- Still Friends at the End
- Quote of the Day
- Trump Still Leads as Clinton Slips
- Clinton Can’t Shake Image as Wall Street’s Friend
- Maddow Doesn’t See Sanders Winning
- Why Does the Media Still Shield Chelsea Clinton?
- Bush Jokes His Mother May Have Abused Him
- Rubio Closes the Gap in New Hampshire
- Newly released interactive map shows images of destroyed monuments of Mosul
- How the Rise of the Post Office Explains American Innovation
- These Americans are reliving history and don’t mind repeating it
- Britain largest home is saved for the nation
- Shelter and the slums: capturing bleak Britain 50 years ago
- WSJ features an article by a conservative calling for the abolition of Black History Month
- Mary Beard, herself a bestselling author, wonders why more women historians aren't
- Princeton U. historian Imani Perry claims mistreatment in parking ticket arrest
- Retired historian George Dennison remains on the payroll at the U. of Montana while faculty are cut
- The Atlantic profiles exciting ways to teach history