The Western Atlantic Modal Haplotype is an abstract statistical construct, representing
the most common marker and allele values found in western Europe and the
Americas. We've reserved this group for members who match the haplotype
definition, but can
not be placed in a more precise grouping.
All members 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).
WAMH men tend to have many matches, sometimes hundreds at 67 markers. SNP
testing can be successful in eliminating "coincidental matches" from consideration.
Your DNA signature is 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.
And on its
FAQ, "Today we know, thanks to superior levels of STR testing and advances in haplogroup
testing, that this motif, even at 12 STR markers, does not represent a single founder dating to the
last ice age but many different lineages within haplogroup R1b. Due to the rapid population expansion
that took place at the end of the last ice age, these lineages at low levels of testing have
experienced convergence. That is, they have mutated to look alike even though they do not share even
middling deep ancestry."
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.