Mitochondrial DNA implies that almost all fashionable dogs drop into 1 of 4 monophyletic haplogroups which can be named haplogroups A, B, C, and D. The majority of dogs drop in just haplogroup A. The mDNA "molecular clock" signifies that 22,800 YBP the very first genetic divergence (split) transpired in haplogroup A, causing the lineages A1b and A2