The link is well worth reading.
In my study I have set 37 as a basic minimum because the odds are that once
a possible match is discovered, this may reopen new documentary routes.
I was influenced initially by cheap kits being available from goons, but
was avoiding from the start the less precise 12 marker kits, that are too
broad to be useful. If the surnames match 37/37, it is at least less likely
that the names arose independently. That may be enough to open up a
correspondence with someone.
Clearly that is not enough if the documentary 'difficulty' is having no
other way to identify your own father or grandfather (being an adoptee,
natural son of a single woman who has died or does not consent to be
approached, for example).
My initial reaction is that even a 111/111 match in the absence of anything
else will only hint at distant cousins with 50% chance, or something more
remote with more certainty.
Of course, documentation from the 'other side' may point to someone being
'in the right place at the right time' but in the limit you only have a
My personal view is that y-dna is only a piece of evidence. Its
interpretation needs parallel evidence before 'reasonable certainty' of a
relationship can be established.
Someone posting on a SOG forum is unlikely to run away with the idea that
y-dna is a magic bullet that does away with masses of research, but I
wonder if the marketing by DNA companies runs the risk of raising false hopes?
On 3 September 2013 08:09:45 "Peter at LostCousins"
> The results of a DNA test for 67 markers show a possible
> between myself and an Australian. The paper trail is proving difficult
> to establish. Are there any benefits in upgrading to 111 markers?
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