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Mitochondrial DNA signifies that almost all present day dogs tumble into 1 of four monophyletic haplogroups that happen to be named haplogroups A, B, C, and D. Nearly all dogs drop in just haplogroup A. The mDNA "molecular clock" indicates that 22,800 YBP the very first genetic divergence (split) transpired in haplogroup A, leading to the lineages