Humans have about the same number of genes as mice (21,000) and share 97.5% of the same working DNA. The difference between the human and chimpanzee/bonobo genome is scant indeed: most edits are epigenetic. The most significant disparity from other primates affects early brain development.
Most DNA in humans comprises backup copies of pre-vious evolutionary advances. They appear to present day judgmental geneticists as “junk”: nonfunctional vestige and redundancy. Instead, this is genetic conservation at work.
Researchers are only now beginning to appreciate the treasure in the apparent genic trash pile. An axiom of evolution is conservative bio-layering: novelty while retaining weak linkage interdependence with biological legacy. Bio-layering is the mechanism behind reversion evolution.