Mitochondrial DNA suggests that nearly all modern day dogs slide into one of 4 monophyletic haplogroups which are named haplogroups A, B, C, and D. Nearly all of dogs tumble in haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the 1st genetic divergence (split) transpired in haplogroup A, causing the lineages A1b and A2. This timing