Mitochondrial DNA suggests that nearly all contemporary dogs tumble into a single of 4 monophyletic haplogroups that happen to be named haplogroups A, B, C, and D. Nearly all dogs slide inside haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the 1st genetic divergence (split) happened in haplogroup A, leading to the lineages A1b an