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Mitochondrial DNA signifies that just about all modern day dogs drop into just one of four monophyletic haplogroups which might be named haplogroups A, B, C, and D. Many dogs drop inside of haplogroup A. The mDNA "molecular clock" implies that 22,800 YBP the first genetic divergence (break up) happened in haplogroup A, leading to the lineages A1b a