Ok, I'm not really sure what the point of the multicultured Egyptian ethnicity is but lets see what you have for me.
One would have to ask the YEC's or other Christians:
*If everyone descended from Adam, how did the races originate?
*If the flood was global, where did the races come from?
The sons of Noah coming down from Ararat in modern Turkey would have had nearly pristine genomes, which holds true for the creatures the Ark housed for six months. Most, if not all, adaptations come from genes being expressed, turned on and off and working in concert and recombined. The descendants of Noah like the creatures that emerged from Ark had the means to adapt quickly, probably within a couple of generations.
This could account for the urgency with which the people building Bable were dispersed. Also, this banding together would lead to inbreeding further limiting the gene flow and even creating bottlenecks if the unions were incestuous. For a couple of generations inbreeding is not dangerous, it's only after several generations that you get diminished immune systems and other degenerative effects.
--- Please remember the earliest artwork and written documentation of the different races dates from c. 2000 BC, ancient egypt.
Following the descent from Ararat and into Mesopotamia they would have naturally followed geographic paths. As they faced different environments and ate different foods they began to adapt to their new places.
When Gregor Mendel did his famous pea plant experiments he was looking at 7 traits involving texture, color and size mostly. He identified dominant and recessive traits occurring in a nearly 3 to 1 ratio with one objective in mind, creating hybrids. One of the problems with this is that the tendency after two generations is to revert back to the original traits. There is also the issue of infertility from selective breeding that Darwin called the 'ban of horticulture' but we won't get into that right now.
The races came from the environments they migrated to and from nearly pristine genomes could readily have done this in a couple of generations. What would have changed would have been external traits like size, color and texture along with things like blood type and a host of other expressed traits.
Now we use the term differently but in Darwin'a day race was used interchangeably with variety and species. It was believed that there was maybe 4 distinct human species and multiple sub-species, this is now know to be false. Darwin spoke of these sub-species in his morbid book the Descent of Man, the example he used were the Irish and the Aborigines.
Ok, we can get into this more later because I'm well aware that I have a tendency to dump the truck on people. Just suffice to say, the differences you identify as race are external traits readily accounted for from a comprehensive application of known genomic molecular mechanisms and processes.
How on earth do you get all racial types in only 200 or so years?
That is no less then 10 generations with overlapping generations occurring almost constantly. There is ample time for the genomic mechanisms to be triggered, engaged and fixed in this amount of time. The biggest problem for me is covering the distance of the 10,000 mile circumference of the globe to all points on the compass. The only real problem after that is the accumulation of mutations, which we see happening ever since on a nearly constant basis. There are repair mechanisms and ways the genome screens mutations through recombination but we can get into that later.
Answer: YEC's ironically embrace macroevolution (e.g. Ken Ham) to explain the sudden origin of the different races in only a few hundred years.
We do, whether Ken Ham knows it or not, embrace an explosive adaptive radiation in a radically short space of time that would have scared Darwin to death. The populations of humans, animals, birds and reptiles would have had to go from dozens of original genotypes to literally millions of species and an enormous number of genus level spceciations.
Yes, of course this is macroevolution on an unprecedented scale but it resulted from genomes that had few, if any mutations following mass migrations to all parts of the globe. It makes perfect sense to me even though that would make Young Earth Creationists among the most radical of evolutionists except that there would be no need for change from the kingdom to the phylum level as far as I can tell.