The Ultimate Alpha Male?

Approximately 8% of the chromosomes sampled from a large region of Central Asia (a remarkable ~0.5% of the world total) belong to a closely-related cluster of lineages in haplogroup C with a time to most recent common ancestor (TMRCA) of 1,000 years (95% confidence interval: 700–1,300 years)
Although it is not uncommon for a lineage to drift to predominance in a single small population, this cluster was found in 16 different populations including the Han Chinese, who are the largest ethnic group in the world, and could not have risen to such a high frequency in such a short time by drift alone.
The cluster seemed to have originated in Mongolia, and on the basis of its time and place of origin, its geographical distribution (which matched the former Mongol Empire) and its presence in putative male-line descendants of Genghis Khan (circa 1162–1227), the authors suggested that this leader, his male relatives and the dynasty that he founded, were responsible for its spread. The alternative explanation would be that, despite the 20,000 descendants of Genghis Khan reported in 1260, just a century after his birth100, no trace of his Y chromosome can now be recognized, but that of another man living at the same time in the same place has spread in this unprecedented fashion.
The human Y-chromosome: an evolutionary marker comes of age, Mark A. Jobling* and Chris Tyler-Smith‡; www.nature.com/reviews/genetics