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DNA Connections
It may be possible to confirm family relationships by comparing test results with John or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
John Duncan:
Family Tree DNA Y-DNA Test 700 markers, haplogroup R-FT269028, FTDNA kit #989197, MitoYDNA ID T18613[compare]
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John:
100.00% 100.00%
John Duncan:
Family Tree DNA Family Finder, GEDmatch JM6364364[compare], FTDNA kit #989197