Mitochondrial DNA implies that almost all modern dogs slide into just one of 4 monophyletic haplogroups which happen to be named haplogroups A, B, C, and D. Many dogs fall within just haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the initial genetic divergence (split) happened in haplogroup A, leading to the lineages A1b and A2.… Read More