Tuesday, October 22, 2013

Our New Found Cousins



Neanderthals and modern humans weren’t the only humanoid species that coexisted with each other. Due to recent discoveries of finger bones in a Denisova cave on Altali Mountains of Asia suggests that Denisovans coexisted with these other species. After an analysis on the finger bone was complete a new line in the family tree for humans was discovered on a genome sequence. The Denisovans DNA was found in the native populations of Australia and New Guinea. Funny enough the DNA seems to be absent on mainland Asia even though the fossil was found there. It is now speculated that this DNA pattern could only exist if the Denisovans successfully cross the marine barrier known as the Wallace Lines (biogeographic barrier that formed along the east coast of Borneo). The biogeographical barrier marks the division of European and Asian mammals. Since the DNA was not found on the mainland of
Asia it is assumed that no interbreeding occurred here suggesting the Denisovans made the marine crossing. The genome map shows evidence of the Denisovans breeding with modern human females. This discovery of a new human species existing is substantiated by the new discovering of the human species Homo Floresiensis (hobbit) in Indonesia confirming there were other human species. The questions that arise now is how were Denisovans able to cross the marine environment? New research shows scientists following the lineage to the ancestors of New Guinea and Australia.


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