So singkee coolie genes are pure blood since from Southern China?
actually not. That's why I say that the whole thing is far more complex than is given proper credit. It's disgusting that nobody teaches this stuff properly. China historically was a conglomeration of various ethnicities under the emperor. They retained their individual identities.
singkee coolies are actually half Vietnamese. (I don't know the actual proportion). Cantonese and Hokkien actually share the same genetic legacy, they were the northern end of the Vietnamese (Baiyue) that got assimilated into China. This where the Cantonese got called the Yue people. If you look at the map of the original Baiyue, you will note that it includes Canton and Hokkien. No wars, no barbarians on horseback. Just a blending.
the purest Han ironically are supposed to be the Hakkas who ran away from the Northern invaders who then subsequently took over the the north and parts of the West. starting from the Yuan empire. I joke that it's because their horses like those areas.