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Archiver > GENEALOGY-DNA > 2010-07 > 1278115015


From: "Belinda Dettmann" <>
Subject: Re: [DNA] Relative Finder - Is my cousin my cousin?
Date: Sat, 3 Jul 2010 09:56:55 +1000
References: <012901cb1a19$7a32df50$6e989df0$@net> <000401cb1a36$4c4aae70$e4e00b50$@com.au><AANLkTim4fBfNituAHhsdAZOPOLdQbLM05yaUr_g9Wp1A@mail.gmail.com>
In-Reply-To: <AANLkTim4fBfNituAHhsdAZOPOLdQbLM05yaUr_g9Wp1A@mail.gmail.com>


Sorry, Rebecca, I should have checked rather than relying on memory. Ann is
right, of course.

Belinda

>The 1% figure would be for 2nd cousins, where both 23andMe and FTDNA say
99% will show a match. First cousins would be expected to have multiple
segments > 5 cM in common. The lowest in my family dataset is 19 segments
(and they were bumped down to the 1st or 2nd cousin range). Others have 28,
38, and 41 segments, so you can see there's quite a range. However, it's
quite unlikely that two first cousins would have no long segments in common.

Ann Turner

> 23andMe gives the odds of matching various cousins somewhere in
> their FAQs (in the Help section) and I seem to recall that the chance of
> not matching a first cousin is 1%. Sounds as though your fifth cousin is
> part of that 1%.
>
> Belinda

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