Relationship Between Modern Humans and Neanderthal

The first Neanderthal fossils found in Europe, a fragmented child’s cranium in Belgium in 1830, and an adult cranium in Gibraltar, were not immediately recognized as a divergent kind of human. Only in 1856 after a partial skeleton was found in a cave in the Neander Valley in Germany it became clear that these fossils belonged to an extinct human and our closest evolutionary relative (Hublin and Pääbo, 2006). Since then, questions about their relationship with modern humans have been fiercely debated between anthropologists. But what attracts most interest from scientists and popular media is the possibility of hybridization between Neanderthals and modern humans if, in other words, they were a genetically different specie or a single specie capable of producing offspring.

The first morphological features that later would become typical of Neanderthals, the projecting middle part of the face and a depression at the back of the skull, have been observed in fossils found in Europe as old as 400,000 years (Stringer & Hublin, 1999). These fossils belonged to Homo heidelbergensis, which in one of the various evolutionary scenarios that ties Neanderthals and modern humans is considered the ancestor of both Homo neanderthalensis and Homo sapiens (Hubmlin, 2009).

Neanderthals lived in Europe and Western Asia between 200,000 and 30,000 years ago. Fossil record shows that around 150,000 years ago (Bar-Yosef, 1998; Grün & Stringer, 2000) their range extended from Europe to Middle East and Asia spreading to Uzbekistan and Russia (Herrera et al., 2009). They were probably the only hominin group living in Europe and Western Asia for a long period of time until the arrival of modern humans. Their extinction is dated at around 30,000 ye...

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