Questions tagged [dna]

For questions about using DNA to further knowledge of family history, relationships, ethnic origin, and overall ancestry. Most common tests include Y-DNA, mitochondrial DNA, and autosomal DNA.

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ySearch Markers

Can any one explain why some of the test on ySearch are listed as FTDNA but have a different set of markers? I.E. in some cases the first 37 markers are missing, in some cases there seems to be a ...
JimL's user avatar
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Why do I get a better match on mitoSearch than FamilyTreeDNA?

For my cousin's mtDNA test (C52RJ) on FamilyTreeDNA, my closest matches are all 2 mutations away, I exported to mitoSearch, and there I find an exact match with TXANE, and the match shows as coming ...
WilliamKF's user avatar
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Identifying John Morgan, son of Thomas D. Morgan (1809-1870)?

I have a real dilemma. I have found a DNA link to the Thomas Morgan (1791-1860) family through Frances Denira "Fanny" Morgan (1821-1899), daughter of Benjamin Francis Morgan (1762-1835), who was the ...
Kay48's user avatar
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Deciding between two competing theories - who am I anyway?

My great(5)-grandfather Daniel Cooper arrived in the US around 1695 (maybe he was born here, maybe born at sea), and while his descendants are relatively well documented, nothing is known for sure ...
Betty Crokker's user avatar
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Getting certified as genetic genealogist

Do you have any recommendations on how to get certification as a genetic genealogist?
lkessler's user avatar
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How can you use FamilyTreeDNA's Search tool to contact matches / find contact information?

How can you use FamilyTreeDNA's Search tool to contact matches / find contact information? I have been continually challenged (as described in the challenges below) by trying to figure out how to use ...
CRSouser's user avatar
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2 votes
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Determining parent ethnicity

My father and I both took Ancestry.com DNA tests. His came back 100% European Jewish, while mine came back 37% Italian and 63% European Jewish. Does this most likely mean my mom is 26% European Jewish?...
CompMan's user avatar
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Birth Record Missing: Joseph C. (POLEO) O'BRIEN 1921 - 1981

My project invlolves finding the proof of birth for: Joseph C. (POLEO) O'BRIEN (born, orphaned, adopted?) Apparent info (not certain) is: BIRTH 05 JUN 1921 • Brooklyn, Kings, New York, USA DEATH 11 ...
Stephen J. Caraccia's user avatar
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1k views

Incest and Shared CentiMorgan Theory. Half/Full Sibling and a Single Transverse Palmar Crease

My female ‘half sibling?’ and I, also female, share 2,129 cM. We DO NOT share the same father. DNA testing revealed that conclusively. Ancestry puts us into Close Family/1st Cousin. DNA painter ...
Curiosity Jones 's user avatar
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Have I found both biological parents, one biological parent or should I keep looking?

My husband's mother was adopted without any records (1910 NYC). I located her biological paternal family along with several possible brothers through DNA. I cannot locate her biological maternal ...
G.H.'s user avatar
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Is the relationship an aunt /niece or half sister to my mother?

I am a genetics beginner: A little back story: My mother was adopted at birth. She found her birth mother and siblings back in the 90s. The birth mother was deceased at the time, and we also ...
J.Huff's user avatar
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Autosomal DNA Chromsome Browser - Is there such a thing as a 'family trait' of shared segments?

I realize the passing of genes is approximately 50/50 (reference Generational Loss of Data with DNA testing) with each generation and which genes are passed are commonly referred to as 'random' based ...
CRSouser's user avatar
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2 votes
4 answers
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Understanding daughter's 314 centimorgans with half nephew

My daughter just learned she shared 314 centimorgans with a boy we believed was her half brothers son. I have just sent in my sample as the supposed father of her 50 year old half brother. We are all ...
Rob's user avatar
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Can paternal half sisters share only 16% dna?

My mom was adopted and knew nothing about her biological dad. We know her biological mother and her family. I'm looking for her bio dad. We both tested on Ancestry. I tested first, and I did the ...
Anna's user avatar
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Calculating Genetic Distance

Is the Genetic Distance between two Y-DNA STR test results simply the number of str values that do not match? For example, if two people have the exact same values for all STR values except DYS413, ...
Baz's user avatar
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Using DNA to find biological father

I have done both 23 & me and Ancestry trying to gets leads on who in the world my birth father could be. My mom truly can’t recall. I found a first cousin or potential great aunt I think. She ...
The Mindful Raven's user avatar
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Would half siblings share the same DNA links to extended family

I've matched with either a half sibling\aunt or niece on MyHeritage - we chatted and it seems like we share the same father. However, I have links to a 1st cousin once removed or second cousin, for ...
Sasha Duguid's user avatar
1 vote
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What is the relationship based on shared DNA

We are trying to find out information regarding my mothers biological father side of the family. My mom was adopted in 1945 and later in life discovered her biological mother but not her biological ...
Adrian Mahon's user avatar
1 vote
1 answer
321 views

Distinguishing half siblings from first cousins (possible fathers are brothers) using shared cM

Regarding half siblings, sent my DNA to Ancestry came to a match of half sibling at 1530 cMs @ 99% half sibling however was in contact with such match and he is claiming my father or one his two ...
Tony  Lombardo's user avatar
1 vote
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ALL 23andme matches link via one grandparent?

I have spent hours today looking at my 23andme DNA matches, and while I have not checked every single one, it seems to me that ALL of them descend from ancestors of my paternal grandmother. I am 100% ...
Victoria T's user avatar
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How is it possible to have an X-DNA/X-Match match on my father's side as a male myself?

On FamilyTree DNA, I have a match who is very clearly from my paternal grandfather's side. I am a male myself and thought it was only possible to have X-DNA matches on my mother's side. I thought my ...
roundtheworld's user avatar
1 vote
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107 views

R1a backbone SNP pack worth it?

I upgraded to Y-67 and my haplogroup stayed the same (R-M198). Would it be worth it to purchase the R1a backbone SNP Pack to get a more specific haplogroup? I currently can't afford Big-Y. I ...
fisherman2's user avatar
1 vote
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806 views

Understanding Native American DNA at gedmatch.com?

How come gedmatch.com shows my alleged Native American DNA, but ancestry.com, FTDNA.com and 23andme.com does not? Does anyone know why that is? What is the difference between gedmatch database and ...
Renee's user avatar
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Confirming my real (genetic) grandfather from 23andMe results

I recently found a photo of my maternal grandparent’s wedding party. I’ll refer to my maternal grandparents as GM (grandmother) and GF (grandfather). I was surprised to see that one of the people in ...
MrAnon1900's user avatar
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Identifying maternal grandfather using DNA

I have recently started the process of grouping my DNA matches on my mother’s side. It's starting to look like the man I thought was my grandfather may not be. I don't have my mother’s DNA but I have ...
Vernpaw Bachman's user avatar
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First Generation/Sibling Match? (using one to one DNA comparison)

Trying to wrap my head around this to determine if this is a legitimate sibling match (?)using report I got on GedMatch (one to one comparison DNA). Report shows: 3557.3 total Autosomal cm/largest 206....
Amy's user avatar
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1 answer
109 views

Half sister has half sister or cousin

My half sister (Maternal) share 1673cM across 50 segments. Cousin #1 to me shares 994cM across 40 segments. Cousin #1 shares 1056cM across 46 segments. Her maybe father is my mothers brother. All of ...
Tfinci's user avatar
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51 views

Nearly identical ethnicity inheritance?

I did the testing through Ancestry, and according to the Ethnicity Inheritance graph (the donut), my parents have nearly identical proportions of Scottish (30% 27%), Irish (10% and 9%), and England/...
penguin97's user avatar
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What is the term for number of descendants, weighted by genetic relatedness?

There are terms for 1) number of children 2) number of grandchildren - but for longer timescales, where you would like to talk about the total genetic contribution still surviving, what terms are ...
fastmultiplication's user avatar
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Is 64.2% / 4776 cM full sibling an outlier?

According to 23andme, my younger brother and I (male) matched 64.2% with 4776 cM. That seemed weird since our matches with our parents are the normal ~50% or just under. This is very much not my field,...
Trev's user avatar
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0 answers
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Can niece not connect to my paternal line but her daughter connects to my maternal and paternal side?

My niece is a dna match 2112 cM over 80 segments. She only matches on my maternal side of the family. Her daughter is a dna match of 1118 cM over 46 segments. She matches both my maternal and paternal ...
Dee Jay's user avatar
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0 answers
45 views

Combining sibling DNA data for easier research

I have DNA from four of my siblings (they were tested at three different places). I'd like to find a way of easily combining our raw DNA data into two files -- even if the files weren't sorted by our ...
TJK's user avatar
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0 votes
0 answers
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DNA not supporting linear genealogy between grandparent, child and grandson?

I am his grandmother and should have 300 or more cMs connection. However, we share only 18 or so cMs. My son, (my grandson's father), shares only 17.2 cMs. What's up?
Carolyn McLendon's user avatar
-1 votes
1 answer
93 views

DNA vs Family Tree

I recently got a DNA match for my wife and it was suggested that this man is a 1st cousin once removed or 2nd cousin. When I pursued that branch of the tree to confirm the match, it seems they are ...
Doug Hirtle's user avatar