THE DEFINITIVE GUIDE TO DOG

Mitochondrial DNA indicates that nearly all modern dogs slide into 1 of 4 monophyletic haplogroups which can be named haplogroups A, B, C, and D. The majority of dogs slide inside haplogroup A. The mDNA "molecular clock" implies that 22,800 YBP the initial genetic divergence (break up) occurred in haplogroup A, causing the lineages A1b and A2. This