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Mitochondrial DNA indicates that nearly all present day dogs drop into a single of 4 monophyletic haplogroups which are named haplogroups A, B, C, and D. The vast majority of dogs tumble inside haplogroup A. The mDNA "molecular clock" signifies that 22,800 YBP the 1st genetic divergence (split) transpired in haplogroup A, causing the lineages A1b a