Short Answer Using this hominin evolutionary tree, indicate roughly when DNA fro

Question

Short Answer

Using this hominin evolutionary tree, indicate roughly when DNA from Neanderthals would have been introduced to the human genome if that Neanderthal DNA was a remnant from a common hominin ancestor. Support your answer by indicating which hominin would be the most likely candidate as the ancestor.

Within each branched group, no further branching is shown. It is unclear how the species are related Species shown next to each other or in overlapping time periods suggest they could have coexisted You are here! Homo sapiens Today Homo Homo group Paranthvopus robustus 1 million years ago Homo habils Homo rudolfensis Homo erectus 2 million years ag0 Austraiopithecus africanus Paranthropus boise 3 million years ago Paranthropus group Australopithecus afarensis aetheopicus Australopithecus garhi 4 million years ago Ardipithecus ramidus Australopitnecus anamenss Ardipithecus group 5 million years ag0 Australopithecus group Sahalenthropus Araipithecus kadabba 6 million years ago Orrorin tugenensis The major speciation events are shown by the branch points on the trunk of the tree

Explanation / Answer

Neanderthals have contributed approximately 1-4% of the genomes of non-African modern humans, although a modern human who lived about 40,000 years ago has been found to have between 6-9% Neanderthal DNA .

From the given evolutionary tree ardipithecus ramidus is the ancestor of hominides . Because of the ape like lineage indicating that behavioral anlalysis showed. that Ardipithecus could be very similar to chimpanzees, indicating that the early human ancestors were very chimpanzee-like in behaviour.

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