There is said to be less variation in the entire human race than in a typical group of 50 African monkeys of the same species, indicating a very recent bottleneck of some sort for the human race. Of such variation as there is, the major divide is East/West and not North/South, i.e. the black and white races are genetically closer to each other than either is to the yellow. That’s probably because Semitic, Hamitic, and Japhetic (IE) peoples are actually descended from Noah and his sons while East Asians survived the flood on mountain tops and anything which could float for a year or so, as per their own literature.
That makes East Asians and Europeans equally descended from one group of Africans.
That group itself is somewhat removed from the other African groups.
The solution to the Amer-Indian conundrum is simply that North American Indians have a degree of European ancestry from a single group dating back about 14,000 years. Try:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1199377/
I didn't find any mention of the Sa'ami in this study ~ that's a shame since they appear to have been the first inhabitants of Scandinavia.