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TERRY FAMILY HISTORIAN    TERRY GENFORUM     TARRY  GENFORUM    TERRY GROUPS

TERRY - HAPLOGROUP I - LINEAGE III - Discussion

Haplogroup I

(This is of course a work in progress)

Individuals in this group who have DNA tested as of April 09, 2007: T-6, T-27.

This Terry family had descendants in Virginia, Kentucky and migrated to Arkansas, Texas and Illinois. It is not known how T-6 and T-27 are related; however, there is a perfect 37/37 marker match.

Note by Mike Terry: The Gaddy/Gaddie family has a presence in Bedford County, Virginia. However, there are no records indicating John Self Terry was in this area.  In the Terry Family Historian for September 1986, page 136, there is a query by William L. Strickland of Little Rock, Arkansas which indicates John married Francis Gaddy in 1798  in Madison County, Kentucky. Present day Madison County, Kentucky was formed in 1785 from Lincoln County while it was still a part of Virginia. Actual marriages records indicate May 28, 1797 in Madison County, Kentucky.

 

In comparing 37 markers, the probability that T-6 and T-27 shared a common ancestor within the last....
4 generations 8 generations 12 generations 16 generations 20 generations 24 generations
83.49% 97.28% 99.55% 99.93% 99.99% 100%

*The above numbers are based exclusively on the comparison of their Y-DNA results, which show no mismatches. I believe a generation is considered to be 25 years.


The FTDNATiP results are based on the mutation rate study presented during the 1st International Conference on Genetic Genealogy, on Oct. 30, 2004. The above probabilities take into consideration the mutation rates for each individual marker being compared.
  
Since each marker has a different mutation rate, identical Genetic Distances will not necessarily yield the same probabilities. In other words, even though T-10 has a Genetic Distance of 1 from T-2, someone else with the same Genetic Distance may have different probabilities, because the distance of 1 was prompted by mutations in different markers, with different mutation rates.