Author Topic: Humans Broke Off Neanderthal Sex After Discovering Eurasia  (Read 699 times)

0 Members and 1 Guest are viewing this topic.

Online Buster's Uncle

  • Celebrating AC2's 10th Year- Little Terraformer That Could
  • Ascend
  • *
  • Posts: 47329
  • €795
  • View Inventory
  • Send /Gift
  • Because there are times when people just need a cute puppy  Soft kitty, warm kitty, little ball of fur  Someone thinks a Winrar is You!  
  • AC2 is my instrument, my heart, as I play my song.
  • Planet tales writer Smilie Artist Custom Faction Modder AC2 Wiki contributor Downloads Contributor
    • View Profile
    • My Custom Factions
    • Awards
Humans Broke Off Neanderthal Sex After Discovering Eurasia
« on: October 05, 2012, 12:24:34 PM »
Quote
Humans Broke Off Neanderthal Sex After Discovering Eurasia
By Charles Choi, LiveScience Contributor | LiveScience.com – 14 hrs ago.. .

 
Neanderthals apparently last interbred with the ancestors of today's Europeans after modern humans with advanced stone tools expanded out of Africa, researchers say.
 
The last sex between Neanderthals and modern humans likely occurred as recently as 47,000 years ago, the researchers added.
 
Modern humans once shared the globe with now-departed human lineages, including the Neanderthals, our closest known extinct relatives. Neanderthals had been around for about 30,000 years when modern humans appeared in the fossil record about 200,000 years ago. Neanderthals disappeared about 30,000 year ago.
 
In 2010, scientists completed the first sequence of the Neanderthal genome using DNA extracted from fossils, and an examination of the genetic material suggested that modern humans' ancestors occasionally successfully interbred with Neanderthals. Recent estimates reveal that Neanderthal DNA makes up 1 percent to 4 percent of modern Eurasian genomes, perhaps endowing some people with the robust immune systems they enjoy today.
 
The Neanderthal genome revealed that people outside Africa share more genetic variants with Neanderthals than Africans do. One possible explanation is that modern humans mixed with Neanderthals after the modern lineage began appearing outside Africa at least 100,000 years ago. Another, more complex scenario is that an African group ancestral to both Neanderthals and certain modern human populations genetically diverged from other Africans beginning about 230,000 years ago. This group then stayed genetically distinct until it eventually left Africa. [Top 10 Mysteries of the First Humans]
 
To shed light on why Neanderthals appear most closely related to people outside Africa, researchers looked at similar DNA chunks in European and Neanderthal genomes. When sperm and egg cells are created, the strands of DNA within them break and rejoin to form new combinations of genetic material. This "recombination" decreases the length of the chunks in each generation. By comparing lengths, "we can estimate when the two populations last shared genes," explained researcher Sriram Sankararaman, a statistical geneticist at Harvard Medical School.
 
The research team estimates modern humans and Neanderthals last exchanged genes between 37,000 and 86,000 years ago, and most likely 47,000 to 65,000 years ago. This is well after modern humans began expanding outside Africa, but potentially before they started spreading across Eurasia.
 
These findings suggest modern humans last shared ancestors with Neanderthals during the period known as the Upper Paleolithic. Back then, modern humans had begun using relatively advanced stone tools, such as knife blades, spear points, and engraving and drilling implements.
 
"I think we will be able to get new insights on how modern humans adapted as they occupied new regions," Sankararaman told LiveScience. "It shows the power of genetic data to learn about historical events."
 
Future research will explore other prehistoric interbreeding events, such as the apparent mixing between ancestors of modern Papuans and the recently unearthed extinct human lineage known as the Denisovans.
 
"There are technical challenges here," Sankararaman said. "Papuans have had gene flow from Neanderthals and from Denisovans. That makes it challenging to tease their contributions apart."
 
The scientists detailed their findings online Oct. 4 in the journal PLoS Genetics.
http://news.yahoo.com/humans-broke-off-neanderthal-sex-discovering-eurasia-210718879.html

 

* User

Welcome, Guest. Please login or register.
Did you miss your activation email?


Login with username, password and session length

Select language:

* Community poll

SMAC v.4 SMAX v.2 (or previous versions)
-=-
21 (7%)
XP Compatibility patch
-=-
9 (3%)
Gog version for Windows
-=-
89 (30%)
Scient (unofficial) patch
-=-
34 (11%)
Kyrub's latest patch
-=-
14 (4%)
Yitzi's latest patch
-=-
87 (30%)
AC for Mac
-=-
2 (0%)
AC for Linux
-=-
6 (2%)
Gog version for Mac
-=-
11 (3%)
No patch
-=-
15 (5%)
Total Members Voted: 288
AC2 Wiki Logo
-click pic for wik-

* Random quote

Red-hot iron, white-hot iron, cold-black iron; an iron taste, and iron smell, and a Babel of iron sounds.
~Charles Dickens ‘Bleak House’, Datalinks

* Select your theme

*