This draft workpaper was last modified .
My paternal-line ancestral roots originate in mainland Asia ~29,400 years ago from the predominant China sub-group.
As of ~12,000 years ago, my paternal ancestors reached the southeast China coast and/or the island of Taiwan.
My paternal haplogroup O is almost nonexistent in Western Siberia, Western Asia, Europe, and Africa and is absent from the Americas.
A ten-generation family tree has 1,024 ancestors. Yet as is true of mtDNA, the Y-DNA test has the power to reveal information about just a single person out of those 1,024 ancestors. The Y-DNA test permits me to pursue deeper into my genetic male line of ancestors.
Only men inherit the Y chromosome, and my father inherited his Y chromosome from his father, who inherited it from his father and so on ad infinitum. Thus, the Y chromosome is passed down from father to son basically unchanged.
Geneticists can go back in time and trace these Y-DNA markers to the point at which they first occurred. Moreover, people who share the same marker share a common ancestor and belong to a haplogroup, which in my case has been established as haplogroup O. Through the Y-DNA lens I view intact copies of Y-DNA that each generation of fathers pass on intact to their sons. Likewise, each marker represents my most recent common ancestor (MRCA) from which all the men with that marker are direct descendants. Following is this sequence of ancestral markers.
My defining genetic marker O-M175 originated in present-day China. The marker remains mostly present among male populations in East and Southeast Asia and is associated with the Chinese people and the Han Chinese lineage. It dominates the East Asian Y chromosome gene pool and accounts for 75% of the entire paternal lineages of Chinese. Yet, it is almost nonexistent in Western Siberia, Western Asia, Europe, and the Americas.
My ancestor with the DNA Marker O-M122 appeared As the result of my O-M175 ancestor experiencing a genetic variation. It resulted in his offspring gaining a genetic trait he didn't have, which was a new genetic marker. In genetic genealogy terms, his had progeny formed the marker O-M122 downstream (closer to present times). The O-M122 marker thus becomes known by the acronym MRCA (Most Recent Common Ancestor). To that point, he became the most recent man from which all the men in the M122 branch of haplogroup O are direct descendents.
Yet, while I know when he lived, I only know the general locations of his hunter-gatherer existence. Figure 22 shows my ancient father-line ancestry geographically. As a proto ethnic Han Chinese, he likely lived a nomad existence, staying near rivers and lakes, possibly along the 600 mile stretch of the Yangtze River believed to be the cradle of ancient civilizations. To that possibility, he may have lived in the river section known as the Middle Reach and, in the vicinity of the present day, Hubei Province of China, the location of the famous Three Gorges.
In any case, the O-M122 marker is the predominant sub-group in China. Yet, while it exists is present at high levels amongst Han Chinese, it is also present in Tibeto-Burman populations as well as Yunnan, Tibet, Myanmar, Northeast India, and Nepal, Manchu, Mongolia, Korea, Vietnam, Malay, Philippines, Thailand, and others.