From: john1@s145802280.onlinehome.fr   
      
   On 11/12/2023 23:28, JMB99 wrote:   
   > On 11/12/2023 16:02, Colin Bignell wrote:   
   >> I wouldn't expect that level of precision from a commercial DNA   
   >> test. It would need a very large number of samples from people with   
   >> a long background of living in the area, which the commercial   
   >> companies usually don't have.   
   >>   
   >> Ancestry can tell me that my DNA shows links to East of England,   
   >> but not that they are to North Norfolk, let alone which towns or   
   >> villages my ancestors came from.   
   >>   
   >> The problem is that DNA gets passed in chunks, not a nice even   
   >> division of 50% of everything each of your parents had in their   
   >> DNA. This means that even siblings might have different ethnicity   
   >> estimates, depending upon which chunks they got.   
   >   
   >   
   > Might have hoped with the amount of interest in Irish ancestry from   
   > Americans that might have built up a lot of data.   
   >   
   > One of the TV DNA programmes did manage to identify a village in   
   > Ireland and family of someone but I think they did some DNA testing   
   > of people in the area.   
   >   
   >   
   Ancestry have several web pages of information on their ethnicity   
   estimates and methodology   
   e.g.   
   https://www.ancestry.com/c/dna-learning-hub/reading-your-ethnicity-estimate   
   https://support.ancestry.com/s/article/AncestryDNA-Ethnicity?language=en_US   
      
   and a detailed (41 pages) Ethnicity Estimate 2023 White Paper giving   
   methodology, sample sizes, etc   
   https://www.ancestrycdn.com/support/us/2023/10/ethnicitywhitepaper2023.pdf   
      
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