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.

Filter by
Sorted by
Tagged with
1
vote
0answers
34 views

Half uncle cM match to niece/nephew not same as reverse match

My mother's half brother and I both submitted DNA samples to Ancestry. His came back 393 cm related to me. Mine came back 795 related to him. Why would there be such a large difference?
0
votes
1answer
25 views

Understanding DNA match of 2,559cM to grandparent

I received my DNA results from Ancestry. My first DNA match ended up being my paternal grandpa. We shared 37 percent of our DNA and 2559cm. If that seems high, what could be causing so strong of a ...
3
votes
0answers
40 views

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 ...
0
votes
2answers
39 views

DNA matches half uncle

I was wondering if anyone could answer this question I have. I have DNA match with my half uncle ( fathers side) , and I also have a half great Aunty - mother’s side. My sister has a slightly higher ...
1
vote
0answers
27 views

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 ...
0
votes
0answers
49 views

3rd Cousin DNA with a person

I share a DNA match with a male person of 152cM coming up as a 3rd cousin. I also share a match with his half brother but much Lower at 45cM. These two share the same father but different mothers. I’...
1
vote
0answers
31 views

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 ...
0
votes
1answer
52 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 ...
0
votes
0answers
61 views

2nd cousin showing up as DNA match

I recently discovered I shared a DNA match with a lady of 341cMs of whom I don’t know. I’ve since made contact with her and some missing gaps discovered. She has a half sibling (1972cm) - brother , (...
0
votes
0answers
17 views

Father is a twin, closest DNA match is 1,723 CM's [duplicate]

My closest DNA match is 1,723CM's across 32 segments with the longest segment being 217 CM's. My next closest match is a cousin of the first match 886 CM's across 31 segments with the longest being 78 ...
0
votes
2answers
92 views

Understanding DNA match of 1,723 cM

I have a DNA match of 1,723 cM with a male 6 years younger than me. His father is one of a twin, could my match be not my half-sibling but my 1st cousin.
3
votes
2answers
5k views

Sharing 52% DNA with mother

I received my 23 and me results and it says I share 52% DNA with my mom. Is this possible?
1
vote
0answers
39 views

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% ...
0
votes
1answer
63 views

2 unknown grand fathers

I have known for a long time that my fathers father is unknown. Unfortunately, I have learned that my mothers father is unknown also. I have recently received my DNA results but the nearest match is ...
2
votes
2answers
81 views

Shared DNA when MRCAs are Cousins

On average, 2nd cousins are expected to share about 1/16 of their DNA. If parent-child share 3600 cM, then the 2nd cousins would share on average 1/16 of that or 225 cM. The 2nd cousins share a set of ...
0
votes
1answer
38 views

Does DNA match of 1,781 cM suggest half siblings? [duplicate]

I have been contacted by someone who says we are half sisters due to our DNA match. Our DNA is 1,781 which apparently is a high match. Would this make us half sisters? I am an only child and she is ...
3
votes
1answer
67 views

Why does 23andMe say there's “not enough information” on a few of my chromosomes?

I've been looking at the chromosome painter and my matches in 23andMe, and realised I have a few chunks of DNA that are greyed out and read "not enough information", and therefore don't ...
2
votes
1answer
209 views

DNA implications if my Gr Grandfather is also my Dad's father? (incest)

I am trying to find my family of origin. My dad died several almost 15 years ago before DNA was a common thing. He was adopted and never knew anything about his birth parents and he never wanted to ...
0
votes
1answer
35 views

331 cm Uncle - could it be different relative

On 23&me the DNA results came in yesterday and it exactly states "You & John share the DNA that was passed down from two of your grandparents (his parents)". We have 331cm in common ...
1
vote
2answers
45 views

Identifying paternal grandfather using DNA tests if birth name is unknown

My paternal grandfather was raised by others and took their name, but he was not officially adopted. I have no idea of his real name. Can I still find him/family with DNA test(s) and, if so, which ...
3
votes
3answers
137 views

How can two different generations of one family be a half sibling to an outsider?

My full paternal uncle and I enough cM with an outsider to both be listed as half siblings to an unknown male. My uncle shares more cM with that unknown male than I do (a female). Both my uncle and I ...
2
votes
2answers
56 views

Y-dna upgrade or SNP pack?

I took the Y-dna12 test first, it came out as J-M67 but I want to proceed to find out my subclade and I can't decide to either get the J2 - M67 & L24 SNP Pack or to upgrade to Y-DNA67. What would ...
1
vote
1answer
210 views

Does 23andMe limit matches?

Out of 1500 DNA matches, none are more distant than estimated 5th cousin (15 Centimorgans). Do 23andMe have a 15 Centimorgan cutoff, or a cutoff of the number of matches that is limiting how many ...
2
votes
1answer
29 views

Can two Paternal Y-DNA Haplogroups still be identical if they are processed on two different 23andMe Chips?

I have a male match on 23andMe that I'm fairly certain is a Paternal match through my Paternal Grandfather. As far as I understand it, I should have a (nearly?) identical Y chromosome to him. ...
2
votes
2answers
112 views

23andme shows a man as my dad's cousin, but ancestry.com shows him as my dad's brother

I did 23andme, and so did our mystery man. Two of my grandfather's brothers also did 23andme, as well as a number of the kids and grandkids of my grandfather's brothers and sisters (my grandfather ...
0
votes
1answer
71 views

DNA half-sibling

My brother did an Ancestry DNA test last year and last week got notification of a new close relative match. The man matches at 1695cM which indicates grandparent/grandchild/uncle/nephew/half-sibling. ...
0
votes
1answer
57 views

What is the cut off for a half-sibling and first cousin in CM's?

I am adopted and was searching for my birth family and found a cousin and since then I had someone in the family helping me with the search. I found someone who I think is my half-sibling. She did a ...
0
votes
1answer
90 views

Trying to narrow down biological grandfather

I have been working on finding my biological grandfather. The closest DNA match I have to my father (who has taken a test) is 1015cM. I've narrowed down his father to either her father or her uncle. ...
2
votes
2answers
137 views

Do two halves make a whole?

Jack has a half brother. Jill has that same half brother. Jack and Jill are not related. Jack and Jill have a child. The brother becomes the half uncle to the child on his brothers side and on his ...
1
vote
1answer
115 views

What would the cM range be for persons sharing the same mother and the fathers are brothers?

I had a swab test performed to establish sibling-ship through DNA Diagnostic Center (DDC) wanting to confirm what I thought was certain paternity with myself, male sibling and and mother (father ...
2
votes
1answer
84 views

Mapping DNA relationships on paper

I have recently started digging into my DNA matches. I have several closely related matches. I was born in Montana and my grandma was married to a man who has no biological relationship to me. However ...
-2
votes
1answer
68 views

Understanding half sibling test report

I had requested DNA analysis of my half sibling and have received the results. But unfortunately I am confused with results of the conclusion, meaning the conclusion which is in bold and the sentence ...
2
votes
1answer
146 views

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 ...
2
votes
0answers
38 views

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?...
2
votes
2answers
79 views

Is my match a first cousin or half sister?

My brother and I show up as full siblings (2310cM shared). He shows up to cousin #1 (thru our mother) 976cM shared and cousin #2 (thru our father) 813Cm shared. However, I share with cousin #1 920cM (...
7
votes
3answers
127 views

Is there anything wrong with using small DNA segment matches as evidence?

Many people find relationships with other people that they only share a small amount of DNA with, e.g., 10 cM or less. They then, after researching the other person's tree, find a common ancestor and ...
0
votes
0answers
58 views

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 ...
1
vote
1answer
69 views

DNA Second cousin

My husband recently discovered that he is 52% European Jewish through an Ancestry test. He matched with a female second cousin that is 100% European Jewish. Is there a way to know which side (mother ...
1
vote
0answers
42 views

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 ...
-1
votes
1answer
85 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 ...
2
votes
0answers
46 views

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 ...
4
votes
1answer
67 views

Benefit of Y-DNA testing self vs father or grandfather?

I am planning on taking a Y-DNA test. As a male myself, if there is an option to test my father or paternal grandfather instead, would there be any practical benefit? I am not inclined to test more ...
2
votes
1answer
65 views

Changed Birth Certificate number

The certificate number on my grandfather's birth certificate from 1893 was changed. You can see the original, crossed out number just above the new number. When he passed, and the family found his ...
2
votes
0answers
367 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 ...
0
votes
1answer
75 views

9 of my top 11 DNA matches (three generations) show the category of 1st -2nd cousin

I am trying to find my biological father. I believe he is one of 5 brothers and am ALMOST sure of which one. My top 11 DNA matches (all relatives of those 5 brothers) state 1st - 2nd Cousin, however,...
2
votes
1answer
85 views

How many STRs should I test for medieval genealogy?

I have been researching my Maltese paternal line for a long time now, and fortunately due to one of my distant ancestors being upper class, my genealogy is well documented up until the around 1490, ...
2
votes
0answers
96 views

Triangulation in DNA, weird match!

I thought I had grasped the meaning of triangulation. Until I saw this match in MyHeritage (see below). What is happening? It looks like the two segments that have the triangulated match are single ...
0
votes
1answer
104 views

Confusing DNA Ancestry

On my DNA results page I'm showing a close family member (1,683cM w/52 segments) and a 1st cousin (914cM w/44 segments.) The close family member share the same last name as a 2nd cousin (449 cM w/13 ...
0
votes
2answers
100 views

Do father and mother pass on same DNA to half siblings?

I grew up in a household with half siblings. Same mother different fathers. I grew up never knowing who my dad was. As I got older I started to ask questions. My mother would push back with resistance....
1
vote
2answers
99 views

Explaining older sister sharing 1,961 cM as close family or 1st cousin

My older sister came back "close family-first cousin". What does this mean? Shared DNA 1961 cM across 74 segments

1
2 3 4 5
8