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Guiding Your Ancestral Search

Guiding Your Ancestral Search. with Autosomal DNA Testing. Susan J. Barretta BIFHS-USA November 27, 2011. http://www.corkgen.org/publicgenealogy/presentations/2011-Nov-27/autosomalDNA.ppt. The autosomal DNA test is based on the 22 autosomal chromosomes.

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Guiding Your Ancestral Search

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  1. Guiding Your Ancestral Search withAutosomal DNA Testing Susan J. BarrettaBIFHS-USANovember 27, 2011 http://www.corkgen.org/publicgenealogy/presentations/2011-Nov-27/autosomalDNA.ppt Susan J. Barretta, BIFHS-USA

  2. The autosomal DNA test is based on the 22 autosomal chromosomes. Family lines may be indicated by chromosomes that clump together and get passed down through generations. A good test strategy is to test the oldest available generation in the line you are researching. Autosomal tests look at ALL lines of inheritance and both genders, not just the lines tested by other DNA tests. Susan J. Barretta, BIFHS-USA

  3. The website of FTDNA explains that it calculates a relationship with a matching person based on the total amount of shared genetic material and the longest common DNA block. CentiMorgans or CMs are a probability measure that segments recombine together. FTDNA says its test can detect matches with a common ancestry back five generations, but some users on the FTDNA forum claim that the test is even more sensitive. A match of between 5 and 10 CMs “implies shared ancestry”; a match of 10 CMs or more “indicates conclusive shared ancestry.” Susan J. Barretta, BIFHS-USA

  4. Known ancestral origins around Skibbereen Susan J. Barretta, BIFHS-USA

  5. Castlehaven R.C. – Records don’t start until the 1840’s; marriage records have not survived. Kilmacabea R.C. – Records don’t start until the 1830’s.Skibbereen R.C. – Years of records are faded and virtually unreadable, making some transcriptions questionable; there are records with no residences recorded in this huge parish.For Ireland in general, 19th century censuses did not survive; Tithe Applotment books record only a fraction of the people present; there are no land valuation records between the TA and the Griffith’s notebooks. Skibbereen is difficult to research Susan J. Barretta, BIFHS-USA

  6. Susan J. Barretta, BIFHS-USA

  7. Case Study #1 Surnames in common with #1 are Mahony and McCarthy – the latter through marriage to a Donovan; the former through marriage to a Kingston. Susan J. Barretta, BIFHS-USA

  8. Case Study #2 No surnames in common. However, Driscoll is in my direct ancestral line and Match #2 has Cadogan – which could be a Driscoll branch. Match #2 has given this information about her ancestry:Cadigan - Clear IslandCrowley – probably Clear IslandDesmond – SchullHart – Heir IslandRegan – SchullShe also reports that Match #1 is in her list of DNA matches. Susan J. Barretta, BIFHS-USA

  9. Case Study #3 Some of the people in Match #3’s family tree show up in some of my Collins cousin records as baptism sponsors or as neighbors. Susan J. Barretta, BIFHS-USA

  10. Case Study #3, continued Match #3’s Sullivan ancestor may have been the baptism sponsor of a very distant cousin. Susan J. Barretta, BIFHS-USA

  11. Case Study #3, continued Match #3 has Croston (Crostin) in his family tree. There were Crostons who were neighbors of distant Collins relatives in Griffith’s Valuation. Susan J. Barretta, BIFHS-USA

  12. Case Study #4 Match #4 is a relatively strong match but his list of surnames made no sense to me at all… not until the remaining Cork church records were released online in October and I discovered that my gg-grand-father had different parentage than what I had originally thought. The people I thought were his parents are likely a cousin branch. Match #4’s surname list (partial) Carr (Ireland) Neiles (Ireland) Logue (Ireland) Langan (Ireland) Sweeney (Ireland) Great-great grandfather’s baptism record Susan J. Barretta, BIFHS-USA

  13. Case Study #4 The MacSweeneys were mercenary soldiers from Northern Ireland and Scotland. There are historical notes of Sweeneys in County Cork as early as the 1400’s. Match #4’s Irish ancestry is in Donegal. Maybe a branch of his Sweeneys peeled off and headed south. For us to be 4th cousins through Sweeneys, the split would have had to occur fairly recently, by roughly the late 1700’s. Susan J. Barretta, BIFHS-USA

  14. Cases with No Further Information (NFI) NFI Case #1 is my second strongest match, but the only surname provided is Henning. I suggested to him that this could be Hennigan, which appears in the general area though it is not a common name. From the Chromosome browser tool I can tell that Case Study #4 is in his list of DNA matches. I have even found a few Sweeney-Hennigan church records in the area. NFI Case #2 has not provided a list of surnames or a family tree. I have not even seen the only surname given (Huntley) in the research area. Susan J. Barretta, BIFHS-USA

  15. DNA testing for genealogy is relatively new and the databases are not very populated, though they do have a heavy British Isles orientation. You may have to wait a while for meaningful matches. Also, some people seem fearful and suspicious of DNA tests. Autosomal testing can be helpful for those who are trying to narrow down a location in the home country. Such a test may direct you to the general neighborhood. Family Tree DNA is offering the Family Finder test on sale for $199 until December 31. You do not have to buy a subscription to view matches. http://www.ftdna.com 23andMe offers a similar test for $99, with a $9/month subscription to view matches (minimum 1 year required).http://www.23andme.com Susan J. Barretta, BIFHS-USA

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