Mitochondrial DNA suggests that almost all contemporary dogs fall into one particular of 4 monophyletic haplogroups that are named haplogroups A, B, C, and D. Nearly all dogs slide in just haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the 1st genetic divergence (break up) happened in haplogroup A, leading to the lineages A1b and