The increased use of commercial DNA analyses kits—Ancestry.com; 23andMe.com—has provided opportunities for people to investigate their genetic histories: ancient genetic additions underlying genealogical investigations. Many individuals of European decent are finding that their DNA is contains a fraction of Neanderthal DNA. In contrast, individuals of Asian descent find that their DNA contains a fraction of Denisovan DNA. In a satisfying twist of fate, many white nationalists are finding DNA of African descent in their DNA.
Neanderthals and Denisovans were two species of humans (Homo neanderthalensis and Homo denisovan) who were believed to have diverged from Homo erectus after it migrated out of Africa about 1.9 million years ago. For whatever reasons, Neanderthals emerged primarily in the European territories and Denisovans emerged primarily in the Asian territories.
Homo sapiens are believed to have emerged 300,000 years ago, migrating out of Africa 115,000-130,000 years ago, over 1.8 million years after erectus. Like erectus, Homo sapiens migrated eastward and westward. Interbreeding occurred to some extent between Homo sapiens and their Neanderthal and Denisovan cousins. Over time, Neanderthals and Denisovans, as species, went extinct, presumably due to the application of the superior mental capacities of Homo sapiens.
Thus, we find that people of European decent find a fraction of Neanderthal in their DNA and people of Asian descent find a fraction of Denisovan in their DNA.
Mongrels, as it were, although with a hefty dose of Homo sapeins DNA.
Are there no pure Homo sapiens around today?
Thinking through the above migration patterns would indicate that those Homo sapiens who never left the African continent would be 100% Homo sapiens. Ancient human remains have been found on the African continent with mixed DNA—Homo sapiens interbred with other human species. Some living individuals include DNA from an unknown species considered a “ghost” species since no bone fragment examples have been found. A gene similar to that found in Neanderthal DNA has been found in ancient African DNA but is thought to have been carried by erectus via migration northward. The gene then mutated into what is now considered a Neanderthal gene.
It is possible, then, that individuals currently living on the African continent whose ancestors 1) never left the continent and who 2) never bred with individuals returning to the continent have retained their 100% Homo sapiens DNA.
Do such individuals exist? Yes. A DNA analysis in 2012 identified individuals from the Yoruba and Luhya peoples (Nigeria and Kenya, respectively) that show no evidence of Neanderthal DNA. These individuals, “Africans” as it were, are pure, 100% Homo sapiens, uncontaminated by DNA from other, extinct, species of humans.
It is reasonable—if not safe—to say that the “original” Homo sapiens were black, originating from the African continent, spreading throughout the world and making it what it is today. Observed phenotypic differences are the result of interbreeding enhanced by adaptions to climate and resources stumbled upon by subsequent generations.
By the way: scientists very strongly emphasize that all humans are Homo sapiens regardless of slight DNA differences among them. This assertion derives from the very definition of a species and a very strong aversion to the racial ranking of humans. There exists no other human species other than sapiens. We have exterminated them.