dna evidence with ancestry
TRANSCRIPT
DNA EvidenceUsing DNA to Verify My Ancestry Tree
Jamie Cox
January, 2016
My Background• Using Ancestry for ~ 4 years
• 1130 People on my tree
• Mostly in Georgia, USA
• I’ve Taken the Ancestry DNA test
• Which of my research lines have DNA evidence?
Data Overload• 254 Pages of matches
• (Over 1200 matches)
• Two 2nd cousin matches
• Eight 3rd cousin matches
• 60 DNA Hints
• 620 4th-6th cousin matches
• 19 DNA Circles
• (I have No “New Ancestor Discovery” Circles)
Back to Basics• What areas of my family tree are solidly backed by
DNA evidence?
• I have a lot of DNA matches that don’t match my tree
• Are any areas wrong?
• How to use all this data?
• Ancestry provides very limited tools
• I Decided to make a paper chart
Fan Chart
Grandparents
Great-Grandparents
GG Grandparents
3rd GGrandparents
Mother’s TreeBrick Wall
Father’s Tree
DNA Circle
DNA CircleDNA Hint
DNA CircleDNA Hint
Wow! No Matches
to Paternal Grandfather’s Tree. Uh-Oh.
Chart InterpretationsAbsence of evidence is not evidence of absence
• Am I the Last of the Mohicans?
• What if I’m one of the only living descendants from this family, and there’s no one else to match … or…
• My paternal grandfather’s folks don’t like genealogy/DNA
• Unlucky DNA - My DNA happens to differ so much as to not be a match
• Non-paternity
The Fourth CaseDNA Match No DNA Match
Trees Match DNA Hint or Circle
Mismatch Alert! X
No Tree Match“New Ancestor
Circle” or regular DNA match
unrelated, ignore
Non-PaternityNon-paternity - anytime someone’s actual parent(s) are not who we think they are
• Non-Paternity Events:
• Infidelity
• Rape
• Secret Adoption - a woman pretends a child is hers to protect the actual mother
Non-Paternity RateGeneration Opportunities
for Error
Total Opportunities
for Error1.2% 1.5% 5.0% Years
Ago
You 0 0 0 0% 0% 0% 0Parents 1 1 1 1% 2% 5% 20
Grandparents 2 2 3 4% 4% 14% 40
GG parents 3 4 7 8% 10% 30% 60
GGG parents 4 8 15 17% 20% 54% 80
GGGGp 5 16 31 31% 37% 80% 100
… 6 32 63 53% 61% 96% 120
7 64 127 78% 85% 100% 140
8 128 255 95% 98% 100% 160
Next Steps• Test Family Members’ DNA
• Father (deceased)
• Mother ✔(Helps identify matches as maternal/paternal)
• Siblings ✔(Complete, another random sample of Dad’s DNA, similar results)
• 2nd or 3rd cousins ✔
• I’m looking for “cousins” who may not be cousins
• Cousins on my tree who have done DNA test (Found 4!)
• They don’t match my DNA - non-paternity confirmed
• Y-DNA Testing ✔ - since my straight male line is now in question
• NO matches to my surname
Help From ancestry.com• We need help with all this data, please
• Ancestry should have drawn that DNA chart for me
• need WAY more searching & sorting options
• User-assignable tags & categories
• AND/OR/NOT filters
• Download DNA matches to spreadsheet