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On y hg diversity in East Asia; sample biases etc
Topic Started: May 30 2017, 01:39:13 PM (42 Views)
black man
The Right Hand
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When you take a look at papers like "Extended Y Chromosome Investigation" by Zhong Hua et al., you notice that there is relatively little y hg diversity in those East Asian populations which are represented by samples. It's hard to guess where one could find hypothetical hgs like "pre-NO", "pre-Q" and "pre-P".

This could be due to the very nature of sample biases and group formation processes in East Asia. E.g., Zhong et al. chose to give the y hg profiles of northern Han, northern TK and HM populations in particular. Of these, northern Han and HM populations are strictly patrilineal. I.e., their ancestors almost automatically reduced potential y hg diversities within their respective groups by maintaining a very distinctive type of social organisation. Further, northern TKs are descendants of fully sedentary people who small-scale riverine populations which seem to have been relatively isolated for quite a while.

So where could certain hypothetical ancient lineages have moved? Obviously, Han expansion and HM clannish organisation are likely to have caused such lineages to have moved away from certain regions. And similarly, northern TK communities might not have been attractive from the POVs of many outsiders for quite a while.

However, the big table of Zhong Hua et al. indicates that F-M427+ lineages could have been assimilated by LB-speaking communities at certain locations in Yunnan. With F-M427+ being generally rare and potentially pre-TB, pre-TK, pre-AA etc, this can be interpreted as implying a period of withdrawal of "exotic outsider" lineages (to remote places like certain locations in Yunnan) until they joined very specific communities which are linguistically mainstream today. For this reason researchers should consider taking into account Han, T(h)ai and Mon-Khmer samples from particularly remote parts of southern East Asia and continental SE Asia. So far, this has hardly been the case. But the results of studies like the ones on which "Human Migration through Bottlenecks" by Cai Xiaoyun is based already indicated the possibility that high resolution could contribute to the identification of previously unknown y hgs which are still associated with "K*", "P*" etc paragroups in the according y hg tables.
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