... wrote on Jul 11
th, 2014 at 7:16pm:
Something that strikes me as odd is how "genetics" distinguishes between which traits we (and by we, I mean white people) consider superficial characteristics and those we don't, so that it "knows" which traits it will allow variation in.
It seems that an entirely different set of genetic laws apply to our internal organs than what apply to the more "superficial" traits like skin and eye colour. Perhaps our resident geneticist could explain this little quirk of science?
I am not a geneticist, Wesley. However, I'll attempt to answer your question.
A single word, Wesley - evolution. Our internal organs have evolved to provide what our body requires so they hardly differ nor need to visibly be different, between the various human groups or even individuals. A human liver will look like a liver and function like a liver no matter where you are or who you are. Ditto for all other internal organs. There is minor and subtle variations, which different genetic combinations account for, such as the inability of many some people to metabolise alcohol easily. This often occurs amongst East Asians but can also occur in other human individuals who aren't Asian, as well. If a need develops for humans to develop new or different organs, then evolution will produce it or we'll die out as a species, as do all that cannot adapt to their environment (unless of course we change the environment and force it to adapt to our needs).
Externally, we differ because it is with the external world our body interfaces. We evolve to meet our environmental needs, fastest and this shows in our superficial, external features. Dark skin for the tropics, because we do not need to metabolise as much sunlight for Vitamin D, light skin for upper-latitudes where we do need it. Long noses for cold climates, to warm the air we breath, before it enters our lungs, flat noses for warmer climates where it isn't needed. Epicanthic folds over the eyelids, to help protect them against cold winds, none, where it isn't as necessary. There are numerous examples.
However, in all cases, we share the same genes, we are of the same species and hence the same 'race". There is no inferiority, no superiority, we adapt over time to our environments. I don't doubt in a few thousand years, we'll have no legs, long arms and ten fingers on each hand, with double thumbs. Can you guess why?