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
349 views

Why no DNA match with possible seventh cousin?

Working on my geneology family tree I discovered my 6th generation grandfather link with another person. I had a DNA test and no match came back with the other person who also had DNA test and I have ...
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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
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 ...
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2answers
543 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 ...
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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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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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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 ...
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 ...
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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 ...
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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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1answer
659 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
241 views

Strange results on DNA Test

I hope someone can help me understand my DNA test results from My Heritage.com. Since i know that my family is kind of mixed, i thought it would be a great idea to see which parts of foreign DNA i ...
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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
615 views

What does 'DD' mean in a name on GEDmatch.com?

On GEDmatch.com I've seen numerous matches that include a DD prefix on a name like: DD Mary Brown What is this convention and what does DD stand for?
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1answer
199 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
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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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
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 ...
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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3answers
1k views

Can my DNA results be wrong?

I am a female, who was adopted at birth. I had been searching for my birthmother and found her through a 2nd cousin match on Ancestry, but she passed away in 2010. I was able to locate her brother,...
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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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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 ...
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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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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
380 views

Using Ancestry DNA Circles to distinguish fathers of children to 2nd great grandmother?

Amongst the descendants of one of my 2nd great grandmothers there is a strong family legend that her first child was conceived in the 1850s by a man other than the husband she married soon afterwards, ...
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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
130 views

Visualising genetic distance information from personal genetics sites

I've been using 23andme.com it shows me a comparison with genetic relatives and lists our common relatives. I have over 1000 3rd, 4th and distant cousins on 23andme. Is there are way to make a ...
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2answers
153 views

How can overlapping ~35 cM segments of matching kits not match each other?

How can overlapping 36.8937 cM (from 11,551,254 to 48,458,402) and 82.9541 cM (from 12,460,601 to 74,135,725) matches on Chromosome 18 not match each other? On GEDmatch, I compare Alice to Bob and ...
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2answers
8k views

Predicted percentages of shared DNA for DNA tests of half-siblings?

My half brother and I each had an Ancestry DNA test. I am female. We share a biological father. Different mothers. Test results show he is my 1st cousin. I am confused. Can you please help me to ...
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3answers
3k views

Where can I find a centiMorgans calculator?

When doing triangulation, I can end up with a segment shared among 3 in a GEDmatch compare where I have the cM for each pair of the three, but not the cM for the overlapping portion of the segment. I ...
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2answers
137 views

Can Origin of Spanish DNA from 16th to 18th generations be traced to historical events?

DNA on Ancestry & GEDMatch -- I find a bit of Spanish with a dash of some Mediterranean groups all dated to 16 or so generations back. Else all British Isles with another dash of Northern ...
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3answers
3k views

Finding out which DNA matches are from paternal side?

I've submitted my DNA to Ancestry and GEDmatch in a desperate attempt to match to anyone from my paternal side. I am unsure of who my father is and my mother will take that information to her grave. ...
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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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1answer
294 views

Why is GEDmatch report omitting some matches?

I ran a GEDmatch multi-kit analysis and got this report for Matches with Joseph's kit, for chromosome 12: And putting a different kit in first position, I get this report for matches with Charlotte: ...
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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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6answers
39k views

Is a half-sibling match on AncestryDNA reliable, or is more testing needed?

I'm new at the DNA testing but here are my results. After receiving my DNA results in January 2016 my first match was with a known cousin who is also on Ancestry with a score of 959 centimorgans at 41 ...
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2answers
469 views

Why is the total shared Centimorgans 52.7%?

Can you please tell me what I have done wrong in my calculation? I added all the Centimorgans from my Gedmatch chart and it gave a total of 3587 which is 52.7% It should have been 50% only. The ...
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2answers
579 views

Is it possible to fall below the lowest amount of shared cMs for a half first cousin and still be a half first cousin?

My father's grandfather was born as one of a set of twins to a woman named Margaret, back in 1886. Margaret was a widow with other children at the time of the birth of the twins. She kept one and ...
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1answer
2k views

What is expected shared cM of double third cousins?

I've come across double third cousins, who are third cousins through two different routes as the same two families had two separate marriages between them that leads to this situation. For DNA ...
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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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4answers
7k views

Could a first/second cousin DNA match actually be my half brother?

I was adopted at birth and know very little identifying information about my birth parents. I recently took a DNA test on Ancestry.com and found a match that was a possible 1st/2nd cousin match. ...
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1answer
167 views

Interpreting DNA Results from 23andMe?

I received my results from 23andMe and I read and read and I just don't understand. I wondered if you could help me? My Mother is 91 years old and never knew who her birth father was. We took the ...
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3answers
4k views

What explains sharing a 28.6 cM DNA segment with a sixth cousin?

According to GEDmatch.com I have a sixth cousin that matches my autosomal DNA on chromosome 6 in a segment that is 28.6197 cM from 16,806,001 to 42,035,791. This only overlaps with my first cousin ...
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1answer
324 views

How is this relationship likely to be 'identified' by a DNA testing company?

I have recently made contact with a putative (half)-first-cousin with whom I may share a grand-father. There is not a definitive documentary trail that confirms her grandfather and mine are the same, ...
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0answers
689 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 ...
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2answers
2k views

Is a Chromosome 23 match less statistically significant for the same cM?

I've noticed that in comparing multiple autosomal kits, I often get a bunch of matches in chromosome 23 for various triangulation compares I've performed. It seems matches on chromosome 23 come up ...
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5answers
10k views

How to get an elderly person to provide saliva sample for DNA?

I have an Ancestry autosomal DNA kit that we are trying to get a 95 year old woman to take and having trouble. I provided the hints that 23andme offers to my cousin that is trying to administer the ...
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1answer
46 views

When will early 2016 23andMe kits be uploadable to GEDmatch.com?

I have a cousin that took a 23andme autosomal DNA test and they reported: I am having trouble uploading my raw data . My 23&me data was purchased more recently so it will not let me download. ...