Within-population genetic diversity is greatest within Africa, while between-population genetic diversity is directly proportional to geographic distance. The most divergent contemporary human populations include the click-speaking forager peoples of southern Africa, broadly defined as Khoesan. Both intra- (Bantu expansion) and inter-continental migration (European-driven colonization) have resulted in complex patterns of admixture between ancient geographically isolated Khoesan and more recently diverged populations. Using gender-specific analysis and almost 1 million autosomal markers, we determine the significance of estimated ancestral contributions that have shaped five contemporary southern African populations in a cohort of 103 individuals. Limited by lack of available data for homogenous Khoesan representation, we identify the Ju/'hoan (n = 19) as a distinct early diverging human lineage with little to no significant non-Khoesan contribution. In contrast to the Ju/'hoan, we identify ancient signatures of Khoesan and Bantu unions resulting in significant Khoesan- and Bantu-derived contributions to the Southern Bantu amaXhosa (n = 15) and Khoesan !Xun (n = 14), respectively. Our data further suggests that contemporary !Xun represent distinct Khoesan prehistories. Khoesan assimilation with European settlement at the most southern tip of Africa resulted in significant ancestral Khoesan contributions to the Coloured (n = 25) and Baster (n = 30) populations. The latter populations were further impacted by 170 years of East Indian slave trade and intra-continental migrations resulting in a complex pattern of genetic variation (admixture). The populations of southern Africa provide a unique opportunity to investigate the genomic variability from some of the oldest human lineages to the implications of complex admixture patterns including ancient and recently diverged human lineages.

Khoekhoe syntax exhibits an unusually flexible constituent structure. Any constituent with a lexical head can be preposed into the focal initial slot immediately before the PGN-marker that marks the subject position. Two strategies of focalisation by foregrounding need to be distinguished: inversion and fronting. Inversion amounts to an inversion of subject and predicate in their entirety. Such sentences have two readings, though, according to their underlying constituent structure: "predicative" or "copulative". Fronting amounts to the preposing of a lexical constituent into the focal initial slot, with subsequent dislocation of the lexical specification of the subject from that slot. The present analysis has wider implications, particularly: The generally accepted view that Khoekhoe has coreferential/equational "copulative" sentences of the type NPsubject = NPcomplement is a fallacy. Such sentences actually are sentences with their predicate fronted into the focal initial slot. They amount to cleft constructions. The fact that the primary focal position is immediately before the PGNmarker of the subject is further independent evidence for the "desentential hypothesis", according to which subject and object NPs in the underlying matrix sentence consist of only an enclitic PGN-marker, and for the claim that Khoekhoe underlyingly is a SVO language, not a SOV language as generally held. By implication these findings affect the analysis of other Central Khoesaan languages.

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An advantage of Namibia's late attainment of independence is that it can benefit from the experience of other African countries that achieved independence some thirty years earlier. Hence Namibia is unique in that it is the only country in sub-Saharan Africa that at the time of attaining independence already provided for constitutional rights for its local languages. The major policy document of the then liberation movement SWAPO, Toward a language policy for an independent Namibia (United Nations Institute for Namibia 1981), which was published in Lusaka by the institute (UNIN) as proceedings of a seminar held in 1980, essentially set the trend for the policies pursued since independence in 1990.

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