Tag Archives | Denisovans

Genetic Analysis Suggests Ancient Humans Interbred Extensively Neanderthals, Denisovans And An “Unknown Population”

neanderthalNature hints that modern humans have a mysterious X factor ancestor:

Genome analysis suggests there was interbreeding between modern humans, Neanderthals, Denisovans and an unknown archaic population. Updated genome sequences from two extinct relatives of modern humans suggest that these ‘archaic’ groups bred with humans and with each other more extensively than was previously known.

The ancient genomes, one from a Neanderthal and one from a member of an archaic human group called the Denisovans, were presented on 18 November at a meeting on ancient DNA at the Royal Society in London. The results suggest that interbreeding went on between the members of several ancient human-like groups in Europe and Asia more than 30,000 years ago, including an as-yet-unknown human ancestor from Asia.

All modern humans whose ancestry originates outside of Africa owe about 2% of their genome to Neanderthals. Certain populations living in Oceania, such as Papua New Guineans and Australian Aboriginals, share about 4% of their DNA with Denisovans.

Read the rest

Continue Reading

Was Human Evolution Caused by Climate Change?

Reconstruction of Neanderthal man. Hermann Schaaffhausen (1888).

Reconstruction of Neanderthal man. Hermann Schaaffhausen (1888).

Via ScienceDaily:

According to a paper published in Science, models of how animal and plant distributions are affected by climate change may also explain aspects of human evolution.The approach takes existing knowledge of the geographical spread of other species through the warming and cooling of the ice ages to provide a model that can be applied to human origins.

“No one has applied this knowledge to humans before,” said Dr John Stewart, lead author on the paper and researcher at Bournemouth University.

“We have tried to explain much of what we know about humans, including the evolution and extinction of Neanderthals and the Denisovans (a newly discovered group from Siberia), as well as how they interbred with the earliest modern populations who had just left Africa. All these phenomena have been put into the context of how animals and plants react to climate change.

Read the rest

Continue Reading