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Mitochondrial DNA signifies that just about all modern day dogs tumble into 1 of four monophyletic haplogroups which are named haplogroups A, B, C, and D. Many dogs tumble inside haplogroup A. The mDNA "molecular clock" indicates that 22,800 YBP the main genetic divergence (break up) occurred in haplogroup A, resulting in the lineages A1b and A2. T