Questions tagged [autosomal-dna]

For questions about autosomal DNA testing for genealogical purposes. Autosomal DNA is the majority of the DNA in our chromosomes, and is passed by both mother and father to child. This includes tests provided by AncestryDNA, 23andMe, and FamilyTreeDNA's FamilyFinder.

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1answer
79 views

Relationship to DNA match who may share my mother with my great-uncle

I know this will sound far-fetched, but maybe someone can help me. DNA Match through Ancestry shows: 'First Cousin' match at 820 CM over 37 segments (Let's call him Tom) 'Second Cousin' match at 541 ...
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2answers
247 views

Estimating centimorgans of shared autosomal DNA between female and half paternal brother?

I am a female. My half paternal brother and I share 328.7 centimorgans across 13 dna segments. Is that possible, or should the numbers be higher?
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3answers
2k views

Can half sibling category actually be full sibling?

I was adopted and used AncestryDNA to help in my search. Recently, I received an alert that a had a match to a "Close Family". People in that category include Aunts, 1/2 siblings. Is there ...
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1answer
957 views

Can half-siblings show different relationships to extended family?

My husband has found a half sibling, first on Ancestry showing a match of 1542 cm over 77 segments, and then confirmed on 23andme with a suggested relationship of "half sibling". Ancestry only showed "...
8
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1answer
349 views

Interpreting DNA matches from endogamous communities?

Mystery match, does not know father. Matches me on mother's paternal side. Me and match: 376.3 cM,15 matching segments, largest segment 47.2cM Me and his daughter: 84.7cM, 4 matching segments, ...
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2answers
562 views

Different genetic relation strength through maternal vs paternal line?

Is there a different genetic relation strength through maternal vs paternal line? In other words: am I more related to my mother than to my father or are they exactly equal? Or another way to ask it ...
4
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1answer
1k views

How am I really related to a person with 1246 cMs and no shared X-DNA?

I have a cousin who is coming up as having 1246.5 centimorgans in common the largest being 103.2 and 1.8 generations. We have no shared X DNA found. I am a female and he is a male. We are supposed to ...
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2answers
85 views

Distinguishing relationships based on DNA numbers and age difference?

I recently joined Ancestry and received several first to second cousin matches, all from what appears to be the same family. The strongest match is 1070 centimorgams and 45 segments. This woman is ...
7
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1answer
264 views

Explaining major discrepancy in genomic position between Gedmatch and MyHeritage?

I have identified a discrepancy with several test kits that were tested at Ancestry, with results transferred to both Gedmatch and MyHeritage, all relating to the same area at the end of chromosome 19....
3
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1answer
171 views

Seeking site to compare Autosomal DNA results from National Geographic and Ancestry?

My elder sister and brother had their DNA done with the 1st Genographic kit from National Geographic. Sadly, they both just recently passed away within 6 months of each other. My sister deceased:July ...
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1answer
126 views

Half brother and sister related to other family?

After taking an AncestryDNA test, I matched a half brother, who I'll refer to as Y to preserve privacy, and sister, who I'll refer to as X. Both appear to come from the maternal side (both adopted ...
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1answer
153 views

Tracing African relative based on autosomal DNA results?

I DNA tested my 3 children and one son shows as 1% Benin/Togo, my ex-father in law has also tested and he shows having SE Bantu. I am guessing 1% means about 10 generations back? Between my ex-in laws ...
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3answers
489 views

Trying to find father using AncestryDNA?

I'm trying to help my friend find out who her biological father is. She currently has no clue. Our starting point is that she has taken an Ancestry DNA test and so has access to some 2nd and 3rd ...
3
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1answer
261 views

Determining 2nd or 3rd cousin relationship

I had a DNA test done with Family Tree DNA while searching for my birth parents. I have identified 2 half-sisters on my birth father's side and several cousins on my birth mother's side. The closest ...
2
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1answer
236 views

Why might number of Shared Ancestor Hints go down on AncestryDNA?

I only received my AncestryDNA results a few weeks ago, and so I am still learning about its functionality. One of the options that I find the most useful is its Shared Ancestor Hints because these ...
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2answers
130 views

Can group of matches on same segment with cM value in mid 20s be out-of-range?

WARNING: This is a question that involves endogamous genetic genealogy. (Not applicable to "normal" or "standard" DNA evaluation). I am still struggling to find some statistical limits/boundaries for ...
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1answer
114 views

Needing further testing to determine half-sib status?

Another AncestryDNA user and I share 1,792 centimorgans across 49 DNA segments. The back story is that I'm a sperm donor baby and this user's father was a donor at the same clinic in the same time ...
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1answer
129 views

Helping my son find his unknown biological father

My son's biological father and his family is unknown. Both my son and I took Ancestry DNA tests. Then I went through his matches for "shared matches" - if I didn't show up, I assumed the match was ...
4
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1answer
302 views

Filtering for Triangulated matches in MyHeritage?

It's a real pain to try and find the triangulated matches that I share with another DNA donor. I might have to click on "show more DNA match" ten times before I see one triangulated match. Is there ...
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0answers
679 views

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 ...
5
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1answer
437 views

Why are MyHeritage atDNA SNPs higher than other test sites?

I have accumulated DNA segment match information from ftDNA, GEDmatch, and MyHeritage. It is just recently that I've added MyHeritage DNA donors data, and I've found that the total number of matching ...
5
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2answers
573 views

Determining shared maternal or paternal lineage via shared DNA segments?

If DNA cousins and I share the exact same segment of DNA, does it always mean we're related via the same side of the family? Background: I have taken DNA tests with National Geographic, Ancestry, ...
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1answer
1k views

Shared centimorgans of second cousins with different paternal grandfathers?

I'm new. Just reading the useful answer to a question about shared centimorgans of first cousins with different paternal grandmothers. I share 238 cM with a second cousin. We can be pretty sure that ...
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1answer
3k views

Shared centimorgans of first cousins with different paternal grandmothers? [duplicate]

On average, how would range of shared centimorgans compare between first cousins who have same paternal grandmother versus first cousins with different paternal grandmothers, same paternal grandfather ...
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1answer
17k views

What is expected shared cM of cousins with only one shared grandparent?

Related to What is expected shared cM of double third cousins?, what would the expected range and average shared cM be? In this case, I'm seeing 64.0 cM over 3 segments. Looking at the table, that ...
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2answers
787 views

Determining if 2nd cousin is father from DNA test?

My partner is waiting on her DNA results. She strongly suspects that her 2nd cousin is her father (long story). Will the DNA results reveal the possibility from more concentrated markers, or less ...
3
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1answer
559 views

How can I determine the likely relationship based upon autosomal DNA shared cM?

Given two tests that share some cM of autosomal DNA, how can I easily find the predicted relationships that such shared cM would suggest? E.g., a 2,200 cM match suggests it could be either: ...
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4answers
1k views

Acceptable number of no-calls in autosomal DNA test results?

Using Gedmatch's file diagnostics, an autosomal DNA test kit I manage shows that there are 31200 (4.4%) no-calls. In most matching algorithms, a no-call is treated equivalently to a match. Therefore, ...
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1answer
103 views

Explaining unshared DNA segments with full sibling?

Recently, a full-sibling had her DNA tested on ftDNA. It was exciting to compare our DNA. But there are a number of things that I found confusing. One was that when I viewed and compared our DNA ...
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3answers
2k views

Converting AncestryDNA 1.0 file format to 2.0 and vice-versa?

I noticed today (1 Jun 2016) that AncestryDNA.com has converted over to their new 2.0 file format, where as about a week ago they were still on the 1.0 format. Both file formats state they are ...
3
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2answers
454 views

Which side am I seeing paternal or maternal?

I took the ancestry.com test as did my 1/2 uncle and 1/2 aunt on my mom's side. I am trying to locate their mother's parents, my grandmother's parents. I was able to narrow the matches down to ...
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2answers
522 views

Adopted and making sense of my DNA matches: which are paternal vs maternal?

I am adopted. I know who my birth mother was and that she came from France. I was conceived in a Brothel in a small town that ironically, my adoptive parents lived only miles from, and that I raised ...
5
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2answers
850 views

Match on Autosomal DNA but no match on X chromosome

I am very new to genealogy and I am hoping someone can advise me. Having uploaded my gedcom to Gedmatch, my best one-one match on Gedmatch is with someone who matches on Chr 8 (14.4 cM) and Chr 11 (30....
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2answers
542 views

53 Segments of DNA

I share 53 segments of DNA with a relative. I’m currently not sure of my exact relationship with them however, but Ancestry.com shows us as cousins with confidence being extremely high. This person is ...
5
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1answer
189 views

Autosomal DNA: Can I tell who is the parent and who is the child?

I have two people who have both autosomal DNA tested. I have both of their match lists which contain all the people each of them matches to. For each person that each of them match to, I have: The ...
5
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1answer
218 views

Is DNA match between two parties that ought not be related by “blood” possible?

I recently completed a autosomal DNA through ancestry. They reported that I had a possible match to another ancestry user with: 30.0 centimorgans shared across 1 DNA segment However, it turns out ...
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3answers
4k views

Does DNA testing show both maternal and paternal ancestry?

Would my sister and I get the same results being I am a brother. Same parents for both of us. I wasn't sure how to ask the question. What I am wondering if the results would show the same geographic ...
2
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1answer
162 views

Matching unknown family member apparent from AncestryDNA?

I had my DNA test done on Ancestry, when I received my results I showed a 1051 CM match to a Sandra. I knew nothing of this person nor could we find any connection. This person lives in Wales. Rumor ...
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3answers
2k views

Interpreting X DNA?

I guess I need a "dumbed down" explanation of these things, since I don't understand the explanations I've read. First, I have a 3rd cousin match from Ancestry who uploaded his info for me on ...
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3answers
471 views

Does having child of DNA tested parent help find parent's DNA ancestors?

If a parent (Charlie, a male) has been autosomal tested, and does not have either of his deceased parents (Alice and Bob) tested, and thus he does not have his autosomal DNA phased between their ...
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1answer
658 views

High match on autosomal DNA, but no X DNA match to mother's half sister

The son of my wife's half-sister recently uploaded his DNA (from Ancestry) to GEDmatch where my wife's DNA (from 23andme) is already recorded. There was a high (846cm) autosomal match, but ZERO match ...
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1answer
2k views

Distinguishing half sibling from niece/nephew using AncestryDNA?

I did the ancestry DNA test and also uploaded my raw data to GEDmatch. I have located two close family matches and I'm wondering how to find out how close we are. Either half siblings or niece/nephew. ...
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2answers
258 views

Next steps once DNA match is found

I've recently made contact with a DNA match I found on myheritage.com. The match is shown as: Estimated relationships: 1st cousin twice removed - 3rd cousin once removed DNA Match quality: 1.3% (93....
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1answer
198 views

Using AncestryDNA to verify biological father? [duplicate]

I believe I have finally found my biological father. I was recently contacted by a possible cousin. Amount of Shared DNA in Ancestry is 548 centimorgans shared across 31 DNA segments. In GEDMATCH ...
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1answer
247 views

What does it mean for two DNA half-matches to not match each other?

I'm looking at my gedmatch.com kit A951428 and found close matches at the same overlapping location of chromosome 3: Kit Chr Start Pos End Pos cM SNPs F236166 3 25,435,600 38,396,...
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1answer
238 views

Understanding matching for Shared Ancestor Hints in AncestryDNA?

This may be related to Why might number of Shared Ancestor Hints go down on AncestryDNA? but I think it is a more specific question, and so, at least for now, I do not think that it should be ...
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0answers
90 views

Looking for 3rd cousins among 4th cousin matches

So I was wondering if its possible in any way to get a hint if someone showing as a 4th cousin match could be a 3rd cousin? From my understanding you can't, but I want to ask if anyone has done this ...
3
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1answer
643 views

Centimorgans and relationship

If two people share 327 centimorgans and 19 DNA segments and are first cousins 1x removed, is it possible that one of them is my 2nd cousin 1x removed if we share 353 centimorgans and 17 DNA segments. ...
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1answer
226 views

DNA tag disappears after tracing many generations back?

When I trace an ancestor back, back and back, suddenly, my DNA link disappears, it's as if one of many greats grandparent misbehaved. I don't think Roger William was misbehaving, but my DNA disappears ...
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1answer
1k views

Can seventh cousins share 54.7 cM of DNA?

I've found two people reported to be seventh cousins who share two autosomal DNA segments: Chr Start Location End Location Centimorgans (cM) SNPs 11 124,632,262 131,124,570 14.4 ...