Life history effects on the molecular clock of autosomes, sex chromosomes

Accounting for the effect of sex-specific life history events, such as the onset of puberty in male hominids, on mutation rates can help reconcile mutation-rate-based estimates of the split between chimpanzees and humans with the fossil record, suggesting that the split may have been as recent as 6.6 million years ago, new research indicates.
Paleontology News — ScienceDaily