Problem:

I've heard that Asians (I'm not entirely sure which subgroup was being referred to) tend to be more genetically homogenous than other races, with people of African lineage being on the other end of the spectrum being the least homogenous.

Question: Is there any truth in the claim that Asians or a specific subcategory such as South East Asians have less genetic variance than other races?

I've seen papers like Extreme mtDNA homogeneity in continental Asian populations for example, but I don't understand enough to know if that answers my question.

Question: If Asians have less genetic variance, would that lead to less variance in phenotypes?

Any help would be greatly appreciated!