<P> Against the traditional interpretation that finds a common origin for the Khoi and San, other evidence has suggested that the ancestors of the Khoi peoples (one subset of the Khoisan) are relatively recent pre-Bantu agricultural immigrants to southern Africa, who abandoned agriculture as the climate dried and either joined the San as hunter - gatherers or retained pastoralism to become the Khoikhoi . </P> <P> Charles Darwin wrote about the Khoisan and sexual selection in The Descent of Man in 1882, commenting that their steatopygia evolved through sexual selection in human evolution, and that "the posterior part of the body projects in a most wonderful manner". </P> <P> In the 1990s, genomic studies of worlds peoples found that the Y chromosome of San men share certain patterns of polymorphisms that are distinct from those of all other populations . Because the Y chromosome is highly conserved between generations, this type of DNA test is used to determine when different subgroups separated from one another, and hence their last common ancestry . The authors of these studies suggested that the San may have been one of the first populations to differentiate from the most recent common paternal ancestor of all extant humans, the so - called Y - chromosomal Adam by patrilineal descent, estimated to have lived 60,000 to 90,000 years ago . The authors also note that their results should be interpreted as only finding that the Khoisan "preserve ancient lineages", and not that they "stopped evolving" or are an "ancient group", since subsequent changes in their population are in parallel and similar to those of all other human populations . </P> <P> Various Y - chromosome studies since confirmed that the Khoisan carry some of the most divergent (oldest) Y - chromosome haplogroups . These haplogroups are specific sub-groups of haplogroups A and B, the two earliest branches on the human Y - chromosome tree . </P>

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