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The B blood type, the most common in China for example, is more prevalent in Poland than Germany, France, or Britain and much more prevalent in Hungary than any of those suggesting stronger Asian ties. Look also, for example, at the distributions of haplogroup C3 as well as N, P, and Q.

And while it's true that a small migration can leave a larger genetic footprint on a small population, a relatively small group of military conquerers can leave a fairly large genetic footprint. A team of geneticists claim that 1 in 12 men in Asia carry a Y chromosome mutation that originated in Mongolia 1,000 years ago, the legacy of Genghis Khan's conquests.

Ghengis Khan had a lot of male relatives ~ they all had the same y-chromosome, and as far as anybody knows his entire tribe could have had that one ~ maybe the greater part of the million man Mongol army for that matter!

They manned up to the task.

That still doesn't mean they end up with a greater than 5% presence in Eastern European backgrounds.

They more than likely simply fit within the existing percentage of East Asian origins ~ which was 5%, and beyond that, indetectable at today's stage of genetic analysis.