In human genetics, the Atlantic Modal Haplotype (AMH) is a Y-chromosome haplotype within the R1b haplogroup.
The AMH is the most frequently occurring haplotype amongst human males in Atlantic Europe. It is characterised by the following marker alleles:
One mutation in either direction, would be AMH 1.15+. The AMH 1.15 set of haplotypes is also referred to as the Atlantic Modal Cluster or AMC. Often 1.15+ would be a haplogroup 1 (H1), but not always.