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Mitochondrial DNA implies that just about all modern dogs fall into one particular of 4 monophyletic haplogroups which can be named haplogroups A, B, C, and D. The majority of dogs drop inside haplogroup A. The mDNA "molecular clock" implies that 22,800 YBP the 1st genetic divergence (break up) happened in haplogroup A, causing the lineages A1b and