RH negative people come from the Neanderthals . . .
Around 600,000 years ago, in southern Europe, a species of man separated off from the ancestral line, and we call this species Homo neanderthalensis, the 'N-people'. The blood of this species contained none of the factors A, B, or Rh.
Much later, possibly around 200,000 years ago in Africa, the main human line had picked up the A, B, and Rh factors (possibly from other primates, the Rhesus factor is named after the Rhesus monkey or macaque), and by then could be classed as Homo sapiens, the 'S-people'.
In competition between related species or races, antibodies in their blood are a powerful genetic advantage for those who possess them when competing against those who don't. History has many examples of European settlers who quite unintentionally won out against native populations because the latter had no antibodies against diseases such as measles which the Europeans brought with them.
In the present scenario, a woman of the N-people (Basque, Rh-) who partnered with a man of the S-people (non-Basque, Rh+) would be likely to bear no more than a single child of the partnership. 'Mixed marriages' in humans are not usually genetically disadvantageous, but in this case they would be. The effect would be a continuing reduction in the N-people population as 'mixed' couples produced only a single child, half the nominal population-maintenance rate.
There are other physical characteristics of humans which are typically associated with Rh-negative blood, but which in the present scenario would be regarded as belonging to the N-people. These include early maturity, large head and eyes, high IQ [6], or an extra vertebra (a 'tail bone' -- called a 'cauda'), lower than normal body temperature, lower than normal blood pressure, and higher mental analytical abilities [5].
Another highly distinguishing feature of the Basques is their language, which is related to no other on earth. According to [3], its ancestor was "spoken in western Europe before (possibly long before) the ancestors of all other modern western European languages". This source states that the most strenuous efforts at finding other relatives for Basque have been complete failures.
People have unsuccessfully tried to connect Basque with Berber, Egyptian and other African languages, with Iberian, Pictish, Etruscan, Minoan, Sumerian, the Finno-Ugric languages, the Caucasian languages, the Semitic languages, with almost all the languages of Africa and Asia, living and dead, and even with languages of the Pacific and of North America. Basque absolutely cannot be shown to be related to any other language at all [3].
The structure of the Basque language is also very distinctive, it is said to contain only nouns, verbs, and suffixes. The language strongly defines the Basque people [8]. In the Basque Language, called Euskera, there is no word for Basque. The only word defining a member of the group is Euskaldun, or Euskera speaker. The land is called Euskal Herria -- the land of Euskera speakers.
In the present scenario, Basque is the descendant of a spoken language originated by the N-people, independently of (and possibly at a much earlier time than) the languages of the S-people.
