First off, i am no anthropologist but i just noticed the poor terminology used on this forum to classify different groups of humans
1. ethnicity and race are not the same thing, they are NOT interchangable terms. There is NO such thing as "Han race", "Korean race", "Manchu race", Japanese "race", british "race",etc,etc. Despite that, Ethnicity does have racial implications, more on that later
2. Han Chinese are NOT racially mixed, only mixed on a sub-racial level. all Han Chinese are racially Mongoloid
3. the science of dividing racially Mongoloid people into sub-races(Sinid, Tungid,Austroasiatic, etc,etc) is considered a pseudo science mostly because no one really researches much into it (ironically, the science of dividing up caucasoids is not considered a pseudo science)
4. Especially do not attempt to label race/phenotype by using language groups. There is no such thing as "Altaic features", "indo european features",etc,etc
misconceptions
1. "race is a pseudo science and race is only a skin deep concept". WRONG, although the true science of race is not perfect, its not a pseudo-science. Anthropologists can identify skulls belonging to certain groups, its clear that race is hardly skin deep. Anthropologists spend years measuring and classifying skulls but it does not mean they have a "racist" agenda
2. "there is no genetic basis for being Han". Han Chinese are certainly hetereogenous but everyone from Dongbei down to Guangdong has a specific lineage traced from paternal Y chromosome and this y chromosome is also found in populations in Korea, Mongolia, and Japan IE there is more Chinese in everyone else than there is in us since they can't really find anything THAT specific regarding genotype in other Mongoloid populations surrounding China.
