我有一个关于蒙古种族问题

@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...

这篇贵州日报的报道很有意思。不知其它省份是否也有大量从元朝留下的蒙古人？中国的学者好像多数认为蒙古人的祖先是鲜卑的一支，但有些蒙古共和国的学者认为他们的祖先是匈奴的一支。不管从哪来，大概很多鲜卑人和匈奴人都留在了中国北方，与当地的汉族和其他民族同化了。不知是否有出土的古尸能把元朝时蒙古人与鲜卑人和匈奴人分开？

@Wang  这是关于蒙古人在贵州非常有趣。感谢您寻找到这一点。

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.  

@ctlb and @Wang 我很欣赏你的输入。这是有道理的。我会做对中国的蒙古来说少数民族一些研究。我的女儿是从贵阳。她的一个近亲可能是从一个少数群体。这是有用的信息！

75.49% Southern Han, 21.59% Mongol Ethnic Group, and 2.87% Shes.