Interesting. If you find a source please share.Our genetics differ in physical appearance alone.Different color roses are identical, except for color.So you're saying that the various races are "sub species " of the "human race" ?? I don't think so. That are just a different variety like different color roses are.The idea that humankind is a mammalian animal species is unacceptable to some, thus the substitute designation, "race." But use of the word race when referring to the taxonomic divisions within the human species becomes awkward when the concept of a human "race" arises. I must ask, do I belong to the Caucasian "race" or to the Human "race?" That simple equation summarily dismisses the validity and usefulness of the word race with regard to divisions within the human species.Race is an artificial concept designed to divide us. "Mixing" therefore is irrelevant.
The simple reality is we humans are another species of animal and, as is it within other animal types, our species is divided into recognizable sub-species, each manifesting its own uniquely distinguishable physical and behavioral characteristics.
Another commonly used term for sub-species when referring to varying types within a "lesser" animal category is, breed -- as in, "Another breed of cat."
Different "colored" humans literally have noticeable differences throughout the body that don't even account for skin "color".
That is actually not true, bio observations show that humans are currently splitting into two incompatible species, by blood chemistry. I forgot the reference article, but it is not the usual rh positive vs rh negative blood grouping.