Showing posts with label Denisovans. Show all posts
Showing posts with label Denisovans. Show all posts

Tuesday, 1 November 2011

The Race Myths Fall Apart

All humans are cousins - but we are also seperate speciations.

A speciation is the process whereby evolution is moving towards the creation of a new species, which is what racial differences are.

They are evolutions towards new species.

Race is just the halfway stage to the new species.

Each race is evolving towards becoming a new species.

The entire ideology of race - from the Far Right to the Liberals and the Far Left - is wrong.

None of them have ideologically accepted the reality of the new facts that DNA is telling us.

The Far Right never stated that we White Northern Europeans are direct descendants of the Neanderthals.

I have been saying that race is the process of speciation for years.

Hopefully one day the right, left and liberals will face reality and accept it.






http://www.telegraph.co.uk/science/science-news/8861602/Siberians-share-DNA-with-extinct-human-species.html#disqus_thread


Researchers have found that people in East Asia share genetic material with Denisovans, who got the name from the cave in Siberia where they were first found.

The new study covers a larger part of the world than earlier research, and it is clear that it is not as simple as previously thought.

Professor Mattias Jakobsson, of Uppsala University in Sweden who conducted the study together with graduate student Pontus Skoglund, said hybridisation took place at several points in evolution and the genetic traces of this can be found in several places in the world.

He said: "We'll probably be uncovering more events like these.

"Previous studies have found two separate hybridisation events between so-called archaic humans - different from modern humans in both genetics and morphology - and the ancestors of modern humans after their emergence from Africa.

"There was hybridisation between Neanderthals and the ancestors of modern humans outside of Africa and hybridisation between Denisovans and the ancestors of indigenous Oceanians.

"The genetic difference between Neanderthals and Denisovans is roughly as great as the maximal level of variation among us modern humans."

The Uppsala scientists' study demonstrates that hybridisation also occurred on the East Asian mainland.

The connection was discovered by using genotype data in order to obtain a larger data set.

Complete genomes of modern humans are only available from some dozen individuals today, whereas genotype data is available from thousands of individuals.

These genetic data can be compared with genome sequences from Neanderthals and a Denisovan which have been determined from archeological material.

Only a pinky finger and a tooth have been described from the latter.

Genotype data stems from genetic research where hundreds of thousands of genetic variants from test panels are gathered on a chip.

However, this process leads to unusual variants not being included, which can lead to biases if the material is treated as if it consisted of complete genomes.

Prof Jakobsson and Skoglund used advanced computer simulations to determine what this source of error means for comparisons with archaic genes and have thereby been able to use genetic data from more than 1,500 modern humans from all over the world.

Prof Jakobsson said: "We found that individuals from mainly Southeast Asia have a higher proportion of Denisova-related genetic variants than people from other parts of the world, such as Europe, America, West and Central Asia, and Africa.

"The findings show that gene flow from archaic human groups also occurred on the Asian mainland."

Skoglund added: "While we can see that genetic material of archaic humans lives on to a greater extent than what was previously thought, we still know very little about the history of these groups and when their contacts with modern humans occurred."

Because they find Denisova-related gene variants in south east Asia and Oceania, but not in Europe and America, the researchers suggest that hybridisation with Denisova man took place about 20 million years ago, but could also have occurred earlier.

This is long after the branch that became modern humans split off from the branch that led to Neanderthals and Denisovans some 300,000 to 500,000 years ago.

Prof Jakobsson said: "With more complete genomes from modern humans and more analyses of fossil material, it will be possible to describe our prehistory with considerably greater accuracy and richer detail."

The findings were published in the online edition of the journal PNAS.









Add to Technorati Favorites

Wednesday, 22 December 2010

The Final Peice in the Race Jigsaw Puzzle

With the announcement of the discovery of the Denisovans the final piece in the jigsaw puzzle of the origins of race is in place.

Race is a product of mixture of Homo Sapiens DNA and archaic human DNA.

The Out of Africa Model and the Regional Development Theory are both correct, in that modern human racial groups are mixtures of both Homo Sapiens and archaic human DNA.

The mystery was the origins of the people of Melanesians.

Now the discovery of the Denisovan DNA strains in modern people from Papua New Guinea proves my theory of the origins of race is 100 % correct.

What we define as race is the percentage of archaic DNA in modern human populations.









There were THREE types of ancient humans: 30,000-year-old fossils prove Neanderthals and modern humans were not the only species on Earth


By David Derbyshire
Last updated at 6:00 PM on 22nd December 2010

Comments (1) Add to My Stories
A mysterious new species of human being who lived alongside our ancestors 30,000 years ago has been discovered by scientists.
The cavemen, called Denisovans, was identified from DNA taken from a tooth and finger bone found in a cave in Siberia.
They walked the Earth during the last Ice Age when modern humans were developing sophisticated stone tools, jewellery and art.
The finding means there were at least three distinct members of the human family tree alive at the time - modern humans, Denisovans and Neanderthals.
DNA taken from this belonging to a young girl was found to be neither from early human nor Neanderthal, and was from a previously unknown species
The bone belonged to a young girl nicknamed the X-Woman.
Provisional tests published earlier this year suggested she belonged to an entirely new species. Now a fully DNA analysis has confirmed her place on the increasingly muddled human family tree.
The discovery follows the controversial discovery of another 'new' species of 3 ft tall human called the Hobbit on an Indonesian island in 2004.
However, many researchers have dismissed the Hobbit, claiming the bones came from a modern human with a growth disorder.
The little finger belonged to a girl aged around five to seven and was found in the Denisova cave in the Altai Mountains in southern Siberia in 2008 alongside ornaments and jewellery.
The Denisovans were physically different from the thickset Neanderthals and modern humans although they also walked upright two legs.
The tooth resembles much older human ancestors - such as Homo erectus - which died out one million years ago.
The Denisovans were similar in looks to homo erectus, pictured, a species which dies out more than one million years ago
The Denisovans lived at a time when our ancestors, and the Neanderthals, were fishing and hunting, wearing jewellery, painting caves and making animal carvings.
The DNA test show that the tooth and finger bone came from different people, the researchers report in the journal Nature.
It is only in the last decade that scientists have been able to retrieve DNA from fossils. Before that they could only identify bones from their shape and size.
The study found extracts of Denisovan DNA in modern day inhabitants of Melanesia - the islands to the north and east of Australia which include New Guinea. That suggests the Denisovans interbred with the ancestors of Melanesians and may have been widespread in Asia.
'This is an incredibly well-preserved sample, so it was a joy to work with data this nice.

'We don't know all the reasons why, but it is almost miraculous how well-preserved the DNA is,' said Dr Richard Green from the University of California, Santa Cruz.
The new species appears to have been a 'sister group' to the Neanderthals and its discovery paints a complicated picture of human evolution and migration out of Africa - the cradle of mankind.
Dr Green believes one group of early human ancestors left Africa between 300,000 and 400,000 years ago and quickly split up.
One branch evolved into the Neanderthals who spread into Europe, while the other moved east and became Denisovans.
Both the Neanderthals and the Denisovans started in Africa but, around the same time, the Neanderthals moved out to the west and into Europe, while the Denisovans headed East
Archaeologists excavate remains Denisova Cave in Siberia. Scientists have discovered a third type of ancient human in the caves
Around 70,000 years there was another wave of migration when modern humans quit Africa.
These were our ancestors and they first encountered and interbred with Neanderthals - leaving traces of Neanderthal DNA in the genetic code of all non-Africans alive today.
One group of modern humans later came into contact with Denisovans, leaving traces of Denisovan DNA in the humans who settled in Melanesia.
'This study fills in some of the details, but we would like to know much more about the Denisovans and their interactions with human populations,' Dr Green said.
'And you have to wonder if there were other populations that remain to be discovered. Is there a fourth player in this story?'


Read more: http://www.dailymail.co.uk/sciencetech/article-1340830/There-THREE-types-ancient-humans-30-000-year-old-finger-fossil-new-species.html#ixzz18rrYBJrL














Add to Technorati Favorites