[Polybius]

According to my host, the same genetic marker spot appears on Mongols. He argued that this marker is a proof that at least some of the Amerinds were descendants of Mongol immigration. Anyone know the truth of this?

It is called a "Mongolian" spot but it could be named after all sorts of Asians.

Mongolian spot is most prevalent among Mongols, Turks, and other Asian groups, such as the Chinese, Koreans, Japanese, etc. Nearly all East Asian infants are born with one or more Mongolian spots. The incidence of Mongolian spot among East Asian infants is 95-100%.[1] It is also common if only one of the parents is East Asian. ...... Among East African infants it is found at rates between 90-95%, and 85-90% of Native American infants.[1]...... The incidence among Caucasians, that is, the indigenous peoples of Europe, the Middle East, North Africa and the Indian subcontinent (Pakistan, India, Bangladesh, Sri Lanka) is between 1-10%.[1] ...... Additionally, there is an incidence of 50-70% among Hispanics,[1] presumably as a result of the Native American admixture found in mestizos (people of mixed European and Native American ancestry) who comprise the largest racial group among Hispanics.

[aruanan]

It wouldn’t be too difficult to see the degree of relatedness between Mongols and “pure” Mayans relative to other groups via mitochondrial DNA.