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Mitochondrial DNA signifies that almost all modern-day dogs fall into 1 of four monophyletic haplogroups which happen to be named haplogroups A, B, C, and D. Many dogs drop inside haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the initial genetic divergence (break up) transpired in haplogroup A, causing the lineages A1b and A2. T