Comments on: Q&A: Everyone Has Two Family Trees – A Genealogical Tree and a Genetic Tree

By: Joe Flood

Joe Flood — Sun, 03 Mar 2013 04:31:14 +0000

I find it very hard to believe that third cousins would not have significant DNA in common. Specifically – one sixteenth!

There is no such thing as “genetic trees”. If you are related you share DNA – it’s that simple.

Of course you might not in fact be related to your third cousin if there has been funny business in the family – that is the first thing I would look at.

JF, co-ordinator COAD, BLOOD and CORNWALL

By: Speculation « Tell the Journey

Speculation « Tell the Journey — Thu, 13 Sep 2012 22:32:20 +0000

[...] FF Forum that discuss the difference between genealogical relationships and genetic relationships: Everyone Has Two Family Trees – A Genealogical Tree and a Genetic Tree and How Many Ancestors Share Our DNA? So Sarah J. Taylor may turn out to be just my [...]

By: Problems with AncestryDNA’s Genetic Ethnicity Prediction?

Problems with AncestryDNA’s Genetic Ethnicity Prediction? — Sun, 24 Jun 2012 06:01:25 +0000

[...] that “Everyone Has Two Family Trees – A Genealogical Tree and a Genetic Tree.” Your Genealogical Tree is the tree containing ALL of your ancestors. However, only a tiny [...]

By: How Many Ancestors Share Our DNA? « Genetic Inference

How Many Ancestors Share Our DNA? « Genetic Inference — Sun, 22 Aug 2010 09:55:29 +0000

[...] at the Genetic Genealogist, Blaine Bettinger has a Q&A post up about the difference between a genetic tree and a genealogical tree. The destinction is that [...]

By: Dora Smith

Dora Smith — Tue, 17 Aug 2010 16:14:56 +0000

Question; what do you say to 23andMe’s claim that what changes across generations is not the relative number of shared segments, but their size? With every generation the segments of shared DNA get smaller because of being progressively chopped up. So that if you’re fourth or fifth cousins, you ought to share a segment that is so big.

By: Kal Spencer

Kal Spencer — Thu, 25 Feb 2010 19:25:50 +0000

I have been doing genealogy for a number of years and was just looking into DNA testing to try and piece togther some distant relatives. Thus is the first time I had ever heard of having a genetic tree. Now that I understand it I am looking forward tot ehday we can have whole-genome testing available to us.

By: Kathleen Brandt

Kathleen Brandt — Mon, 25 Jan 2010 00:59:02 +0000

Thanks for this info. Will need to reread when my mind is fresh, but printed it for early morning. Need to make sure I grasp all!

By: Sanjay Maharaj

Sanjay Maharaj — Fri, 22 Jan 2010 20:03:04 +0000

The genetic tree should be a very interesting project constructing your very own genetic tree. Exciting things to come

By: Zalewski Family Genealogy » Blog Archive » Follow Friday

Zalewski Family Genealogy » Blog Archive » Follow Friday — Thu, 21 Jan 2010 23:38:00 +0000

[...] and your Genetic Tree and how they each may help you find information about the other one. Read his Q&A: Everyone Has Two Family Trees â€“ A Genealogical Tree and a Genetic Tree [...]

By: Victor

Victor — Fri, 01 Jan 2010 18:41:07 +0000

Blaine,
Surfing for similar topics I came upon another blog (Luke Jostins’) that presents an answer to the last two questions in your post above. See it here:
How many ancestors share our DNA?
http://www.genetic-inference.co.uk/blog/?p=728#more-728