Mitochondrial DNA suggests that just about all present day dogs slide into one of four monophyletic haplogroups that are named haplogroups A, B, C, and D. Nearly all dogs tumble inside haplogroup A. The mDNA "molecular clock" indicates that 22,800 YBP the 1st genetic divergence (split) transpired in haplogroup A, resulting in the lineages A1b and A