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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Matching less than 6cM on Ancestry but almost 15cM at GEDmatch

I am communicating with someone who appears to be a 5th cousin once removed. According to AncestryDNA my cousin shares 10cM across 1 segment with my paternal uncle, but is not a match to me (at least ...
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1answer
40 views

Can 1,782 cM shared indicate Half Siblings? [duplicate]

Could a person with 1,782 cM actually be my half-sibling? This person is listed as close family to me, yet I do not know them. My cM is the same as this person's. I do have 6 paternal half ...
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25 views

Ancestry between half siblings [closed]

My half (paternal) sister's son (my nephew) is showing that we are 1st cousins. How is this right?
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1answer
40 views

How can WGS be done on a bone marrow transplant recipient?

Most of the testing companies use a saliva sample that contains white blood cells for doing Whole Genome Sequencing (WGS) of your DNA. White blood cells are created by your bone marrow, so if you get ...
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1answer
118 views

Child of possible incest

My sisters, two aunts and several cousins (on maternal side) did the 23 and me DNA test. One of my aunts (the younger one) showed up as a half sister to me (we share 1,942 cM and 44 segments) and my ...
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1answer
69 views

Understanding 1,537cM match to person and 1,950cM match to their uncle

I have a match with a female that is a few years younger than me (she is in the 60s). She and I match at 1,537 cM across 47 segments. Her Uncle (Paternal Uncle, as far as I know) is a match with me ...
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1answer
46 views

Can a DNA match of 1967cM across 72 segments be a first cousin?

My husband had DNA testing through Ancestry. A woman of about the same age shares 973 cM across 45 segments. We determined that she was probably a first cousin; a child of my husband’s paternal ...
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1answer
33 views

Understanding Ancestry DNA match of 1,668 cM

Can someone help me to understand an Ancestry DNA match of 1,668 centimorgans shared across 52 DNA segment?
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1answer
47 views

X-DNA and Half Sister

I am a female. Another female and I have come up as sharing 1915 cM's and when we do the one to one X-DNA on GED Match, if we click on "prevent hard breaks", we have a straight blue line across the ...
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0answers
41 views

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 ...
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2answers
47 views

Understanding shared DNA of 1,576 cM with great nephew

I had my DNA tested through Ancestry. About a year ago, my great nephew (I'll call him GN-1) whom I raised had his tested. The match came up Close Family–1st Cousin Shared DNA: 1,576 cM across 69 ...
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1answer
48 views

Might 3.46% American Native DNA come from 10 generations back?

If DNA shows 3.46% American Native, then how far back in generations did it come from? I am told it was from a 10 generations back.
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33 views

Does 439 cM shared suggest half uncle rather than half first cousin?

I am trying to determine if my half sister had a different father than the one she grew up with. I was given a name of who the father could be. He has passed away but his son took a DNA test on ...
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1answer
60 views

DNA.Land vs AncestryDNA

I received results back from DNA.Land. Northwest European Includes: Scottish Argyll_Bute_GBR and British in England; Icelandic in Iceland; Norwegian in Norway and Orcadian in Orkney Islands Does not ...
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1answer
45 views

False-Positives in Autosomal DNA Matches

I have spent a significant amount of time and effort beating my head on brickwalls that appear when tracking Ancestry Autosomal DNA matches. I've had success in establishing document trails with ...
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2answers
95 views

Intrepretation of DNA detectable relationships

While quite a number of questions have been asked and answered regarding DNA and relationships, I'm not certain that this question has been asked. I have a 5th cousin that has been identified by ...
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0answers
33 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 ...
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1answer
51 views

Does 866 cM shared suggest half aunt rather than aunt?

There is a joke in my family that my father's father is not his biological father. He only has sisters and his father is dead, so there's no possibility of a true test. But I'm his daughter and I did ...
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1answer
54 views

How does Rutger Map interpolate base pairs (bp)?

I'm trying to use the Rutger's Map Interpolater to calculate the centiMorgan for a specific base pair (bp). How does the interpolater interpolate? So for example I am interested in finding the cM ...
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1answer
56 views

Evaluating half sibling using AncestryDNA?

Recently we (two full sisters and a full brother) think we may have found a half brother who is 50 years old on Ancestry DNA, where he is being categorized as Close Family-First Cousin. sister 52yr ...
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1answer
45 views

DNA/Half-Sibling or First Cousin, Based on Fairly High Shared cMs

Brand new at this and don't have good grip yet on cMs ranges for relationships, especially when number falls in between stated ranges for relationships. Both my dad and I have taken DNA tests from 23 ...
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1answer
38 views

Understanding first cousin and grandson/grandfather relationships at 23andMe

I have 2 first cousin matches on 23andme.. both named ‘John’. Their relationship is listed as grandson/grandfather. With that age difference and relationship they both cannot be my cousin. I’m adopted ...
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3answers
83 views

Half Siblings and DNA Matching

My sister and I are half-siblings. We have always know this and my mother reportedly had an affair during WW2. This was confirmed with ancestry DNA as we only share 1603cM. I'm trying to filter out ...
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2answers
152 views

Finding maternal grandfather

All names in the description below have been changed. My mother is going through a crisis because she is afraid my grandfather is not her biological father. She has been diagnosed with type 2 ...
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1answer
61 views

2nd cousins. One 4%, one 8%?

I’ve recently been matched to two second cousins by DNA. However one shows a 4% match and the other one shows an 8% match. One is on my father’s side and one is on my mother’s side. Why, or how is ...
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2answers
100 views

Finding maternal grandfather using AncestryDNA and GEDmatch

I have my DNA and my mom's DNA on Ancestry and Gedmatch. My mom was adopted. I got her original birth certificate from Kansas and found her birth mom's family (birth mom was deceased) but the man ...
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3answers
331 views

Convert tellmeGen DNA file to FTDNA file or similar to upload it

I have a DNA file from tellmeGen and was wondering whether I can convert the file to an ancestryDNA, FTDNA, MyHeritage or similar file format in order to upload it to myHeritage, FTDNA or DNA.Land for ...
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1answer
55 views

Analysing relationships using autosomal DNA

I (A) am 1095 cm's from a known cousin (M). I (A) am 1224 cm's from an unknown person (S) My cousin (M) is 1458 cm's from the unknown person (S). I (A) am described as a Cousin to (S) (M) is ...
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1answer
112 views

How could I be 10% French when there's no French in my mother or father's DNA results?

Ancestry DNA says I'm 10% French. My father never got tested, but my half sister and cousin on my father's side (who were both identified by the site) both tested as 100% European Jewish. My ...
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1answer
79 views

Understanding shared match of 1,177 cM?

I recently received a "DNA Match" on my account to some one who shows 1,177 cM shared. I am trying to understand what this is really telling me. This is important to me as I do not know who my ...
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1answer
65 views

Understanding 1,102 shared centimorgans?

I took an AncestryDNA test and have matched with a new relative JP. She and I share 1836cM. She’s not my half sister. She’s not my grandparent. She could be my father’s half sister. With this amount ...
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1answer
103 views

How accurate is Ancestor Timeline of 23andMe?

My Ancestry composition at 23andMe states: "You most likely had a French ancestor, second, third, fourth or fifth great grandparent who was 100% French born between 1760 and 1850." How accurate is ...
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1answer
49 views

Does age factor in when calculating relationship on DNA match

A result of 193 cm from 100 year old, matched up to a 35 yo. Does the age of the participants factor in? The sample also showed cross match. The relationship is estimated at 2nd to 3rd cousins. Does ...
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19 views

Does 1,517 shared cM indicate half-siblings? [duplicate]

My husband has a close family match of 1,517cM across 61 segments and his niece shares 906 cM across 40 segments. Is there a chance this is a half brother to my husband and half uncle to his niece? ...
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1answer
65 views

Can 419 and 468 shared cM indicate first cousins?

I was adopted and have known my birth family for many years. I just did a DNA test and found I have 702 matching cM's with the daughter of my mother's brother (making her my 1st cousin). This helps ...
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0answers
17 views

Does 1,427 shared cM indicate half-siblings? [duplicate]

I share 1427cm 54 segments with a close family to 1st cousins with a probability of 93.7% to grandparent, aunt uncle or half sibling. All of my info is that he is related on my maternal side, ...
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1answer
59 views

Does match sharing 952 cM indicate grandparent or great uncle?

My mother was adopted and we are trying to find the parents. I have a DNA match that is 952cM and 38 DNA segments. What is the chance of this being my grandparent? It says 1st cousin and we know ...
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1answer
63 views

Does sharing 1,249cM indicate half sibling?

My husband was raised by his older half brother. We have been told throughout the years that he is actually my husband father.We ran an ancestry test with his daughter. Results were sharing 1249cm ...
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1answer
195 views

Ancestors missing from ThruLines?

At AncestryDNA, until a few days or so ago, all my expected direct ancestors were listed correctly by ThruLines. Now when I look at them some of them have gone missing. For example, today I can only ...
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1answer
83 views

Seeking DNA-test for family membership of ancestor 400 years back along paternal lines?

I have foolishly accepted to act as an advisor to my uncle (on my mother's side), and find that I am quite unprepared to do so. He is trying to follow up a family tradition that his x-GF (all on his ...
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2answers
85 views

Can genetic genealogy identify father of male first cousins with same first name?

Samuel had two sons, Joseph and Abraham in the 1740's (in New Jersey) Joseph had a son, Levi Abraham had a son, Levi One of these (Levi) sons has no further history, the other Levi married and had ...
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1answer
118 views

Family Networks at Living DNA tells me to Keep Fishing?

Late last year (8 months ago) I accepted an offer via FindMyPast to upload my AncestryDNA results to Living DNA. Three months later I followed the instructions in an email from Living DNA to opt-into ...
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1answer
54 views

Using AncestryDNA to work out whether mother or father is parent of half sibling?

How do I work out from viewing my shared matches on AncestryDNA which one of my parents is the parent of my half sibling?
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0answers
20 views

Does 1,957 centimorgans indicate half-siblings? [duplicate]

I have recently had a DNA test and have a shared match of 1957 over 50 segments with one of the matches. They are not interested at the moment in communicating. I was brought up as an only child, so ...
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2answers
121 views

Does 1,864 centimorgans indicate half-siblings? [duplicate]

My sister, daughter and I all took DNA tests for fun. My sister and I show up on Ancestry as "close family," and share 1864 Centimorgans, and we do not share any relatives that my daughter and I share ...
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1answer
180 views

How many generations is needed to go back to get an ethnicity estimate without a DNA test?

I'm a 3rd generation Canadian meaning that my great-grandparents were from Europe and my grandparents are Canadian born. I haven't completed my family tree yet but from the looks of it most of my ...
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2answers
55 views

DNA siblings or cousins

If my mother’s sister and my fathers brother have a have a daughter, how close will her DNA be to mine? Would we be as close as half siblings?
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60 views

Getting certified as genetic genealogist

Do you have any recommendations on how to get certification as a genetic genealogist?
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3answers
97 views

Contacting AncestryDNA match?

I have a match on Ancestry.com with someone who I believe is a nephew who was given up for adoption. I sent 3 messages through Ancestry.com but no response. Do you know of any other way to contact ...
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1answer
132 views

Assessing Biogene DNA results for half-sibling?

My sister and I have a perplexing situation. She believed a family friend to be a half brother, so they got a test at Biogene DNA. It states: Based on the results of the analysis obtained from the ...

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