First, read here, a previous post at this blog.
Second, read here.
Quote
(emphasis added):
Alexander Platt talks about inferring population history using haplotypes. Of
interest: during the last 1,000 generations there are more coalescences between
Beijing Chinese and Japanese rather than Beijing Chinese and southern Chinese;
in more recent times, there are more coalescences between Chinese groups. This
makes some sense, if we suppose that -as seems likely- Mongoloids spread north-to-south
across China during prehistory; the Japanese are thus linked -in older times-
with northern Chinese, both of which are mostly descended from the northern
Mongoloids; in more recent times,
especially after the emergence of a uniquely Chinese polity and culture, the
Chinese tend to marry other Chinese, hence they share more recent common
ancestors within the country itself.
The same can apply to Europe
and any (relatively small) potential kinship overlap that may currently exist
between Europeans and non-Europeans.
Once a “Western Imperium” is established, and gene flow from outside is
stopped, over time, genetic distance between those groups within the Imperium
and those outside will increase. Thus,
even if there is no increase in gene flow within the Imperium, the fact that a
genetic division will be established with the “outer groups” will ensure that
Europeans will, over time, form an ever more cohesive genetic grouping, more
clearly separated from non-Europeans.
Thus, proximate influences ultimate, and genetic boundaries can become
increasingly well matched with political-cultural-civilizational boundaries
once gene flow between civilizational groups is stopped. And there is more than enough genetic
diversity within each civilizational bloc to satisfy biological requirements in
the absence of any inter-continental and inter-civilizational gene flow.
