Radiocarbon dating hominids Grannydating site
First they compare the DNA sequences of two individuals or species, counting the neutral differences that don’t alter one’s chances of survival and reproduction.
Then, knowing the rate of these changes, they can calculate the time needed to accumulate that many differences.
However, there are millions of differences between humans and chimpanzees; our last common ancestor lived over six million years ago.
Recombination, also known as crossing-over, is the other main way DNA accumulates changes over time.
Applying the mutation clock to this count suggests the groups initially split between 750,000 and 550,000 years ago.
As recombination occurs in each generation, the bits of Neanderthal ancestry in modern human genomes becomes smaller and smaller over time.