@GGal WeGene and 23andMe use different reference populations, so it is not surprising that their estimations of your daughter's ancestry composition would differ. If I understand it correctly (I have no other tie to WeGene except for being a customer), WeGene's Mongolic Ethnic Groups (蒙古族群)include not only Mongolians but also other ethnic groups that speak Mongolic languages and reside primarily in China. Probably for these reasons, WeGene also attributes a substantial fraction of my DNA (well over 30%) to Mongolic Ethnic Groups even though 23andMe reduced its estimate of my Mongolian DNA from about 12% to 0% after phasing. WeGene's Chief Scientist @wang can probably give you a more definitive answer.
@GGal In addition, 23andMe's definition of Chinese is broad including not only the Han but probably also varous ethnic groups that speak Mongolic languages and primarily reside in China (e.g., Tu and Dongxiang), but these groups would fall under WeGene's category of Mongolic Ethnic Groups.
@GGal Based on what I've seen, many Northern Han Chinese get significant percentages of Mongolic ancestery at WeGene. So, it is also possible that one or more of her grandparents originally came from Northern China. What are the exact percentages of her ancestry as estimated by WeGene?
"75.49% Southern Han, 21.59% Mongol Ethnic Group, and 2.87% Shes. "
I think probably you can look at the recent northern-southern admixed populations in southwest China. there are actually lots of Mongolians in Guizhou, living together with southern natives. for example, the Mongolian people with surname "Yu" in Bijie:http://www.xjass.com/ls/content/2012-11/21/content_254060.htm
that's only a possibility, make sure not to over-interpret the data...
ancestry compositions highly depend on the reference populations and how many markers used in the estimation. The 20% “Mongolian ancestry" in your daughter would be interpreted as “Mongolian related ancestry”, probably caused by shared alleles with various northern minorities living together with Mongol rather than directly from recent Mongol grandparents.
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I think probably you can look at the recent northern-southern admixed populations in southwest China. there are actually lots of Mongolians in Guizhou, living together with southern natives. for example, the Mongolian people with surname "Yu" in Bijie:http://www.xjass.com/ls/content/2012-11/21/content_254060.htm
that's only a possibility, make sure not to over-interpret the data...
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