There's a subculture within the professional history community (to which I belong) who reject the basically PC idea of "out of Africa," and that mankind developed in several places in the world simultaneously. Some say two, some three, I've even seen an argument for seven regional development centers.
Personally, I believe that East Asians and Caucasians evolved in Central/East Asia separate from any of the others, and Caucasians separated and migrated westward heaven knows when. More and more evidence is accumulating that this partial argument for the "multiple centers" argument is true, regardless of what the PC police want us to believe.
Afrocentrism:
Mythical Pasts and Imagined Homes
by Stephen Howe
Africana
I believe there is genetic proof that mankind today is actually one species with a common heritage. Inter-racial progeny would seem to bear this out.
I'm of a similar belief. Where do you think the Jomon - Ainu fit. The oldest (undisputed) Mongoloid skeleton ever found is 10,000 years old.