The Western Atlantic Modal Haplotype is an abstract construct, representing
the most common marker and allele values found in western Europe and the
Americas. Members in this group are very close to matching the haplotype
exactly, but are off by one marker, AND can not be placed in a more
Those nearly matching the WAMH are also in haplogroup R1b1a2 (shorthand
R-M269). They may fall into either of the two predominant subclades defined by
the SNPs U106 (R1b1a2a1a1) and P312 (R1b1a2a1a2).
Like those exactly matching the WAMH, those who nearly match tend to have
many close matches -- sometimes hundreds at 67 markers. SNP testing can help
eliminate "coincidental matches".
Your DNA signature is 1 point away from the Western Atlantic Modal Haplotype the most common
Y-DNA signature of Europe’s most common Haplogroup, R1b1b2. Simply put your ancestors have
experienced a dramatic population explosion over the past 10,000 years, probably since the end of
the Last Glacial Maximum (LGM-that’s Anthropology-speak for the last Ice Age) that covered most
of Europe beginning 20,000 years ago and lasting for 10,000 long cold winters.
R1b, and its most common Haplotypes (yours), exists in high or very high frequencies in all of
Western Europe from Spain in the south to the British Isles and western Scandinavia in the north.
It appears that approximately 1.25 % of Western European males share this strikingly common
genetic 12 marker signature and because of its very high frequency we always suggest that for
genealogy purposes people in this group should only use our 25 or 37 marker test for their
Anthropologists have been describing for many years that only a select % of all the males in
past societies did the vast majority of fathering, while other males lost the opportunity to pass
on their Y-Chromosomal genes.
On a lighter note it is clear that R1b’s Western Atlantic Modal Haplotype has contributed much
more than its ‘fair share’ in populating Western Europe.