I keep going back to the theory promulgated by archaeologists and anthropologists that humans originated in the Olduvai Gorge in Africa. That explains why human DNA is so close for all people and one can accept blood from any race. Even the Chimpanzee and Human DNA are very close.
But we got out as soon as we could.
Chimp DNA and human DNA are very close. But the maximum possible complexity of DNA is twice that of humans.
Think about it.