Mitochondrial DNA implies that nearly all contemporary dogs fall into a person of four monophyletic haplogroups which are named haplogroups A, B, C, and D. Many dogs fall within just haplogroup A. The mDNA "molecular clock" implies that 22,800 YBP the first genetic divergence (split) happened in haplogroup A, leading to the lineages A1b and A2. Thi