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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11
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3answers
2k views

Generational Loss of Data with DNA Testing

I have personally done the Y-DNA, the add-on Y-block with FamilyTreeDNA, mtDNA, and new FamilyFinder/AncestryDNA (via Ancestry) which i plan in transferring to FamilyTreeDNA just recently as a base ...
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4answers
340 views

How to narrow down the best DNA donors in a large family?

I've been doing genealogy for quite a while, but am new to DNA, having purchased six tests for Christmas. Not all results are in yet, but I have a few good matches. I'd like to get four more kits in ...
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4answers
8k 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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3answers
37k views

What is the significance of “shared centiMorgans”?

I've had my autosomal DNA tested and the site I've used (FamilyTreeDNA) tells me that I have a "Shared centiMorgan length" of 48.08 with my closest match and the "longest block" is 28.89. FamilyTree ...
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6answers
34k 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
988 views

Unknown 1st cousin match who shares matches with both grandparents

I received notice of the following DNA match through Ancestry: 1,193 cM shared across 46 DNA segments, predicted relationship first cousin, extremely high. The next closest match is my nephew (1,...
9
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1answer
548 views

My Father passed away - next test(s) on what remains of his DNA sample?

I posted this general question over at the forum on FamilyTreeDNA. Though I received a reply, there is still no answer to my question, so I thought I'd try my luck at posting here. Anyhow, in early ...
8
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3answers
414 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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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 ...
8
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3answers
165 views

Using shared cM to determine likelihood of misattributed paternity?

My ancestor Harriet Smith was born in the mid-1850s in England. Her birth certificate shows both of her parents (John Smith and Sarah Johnson). For the purposes of the birth registration, John and ...
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2answers
3k views

Understanding chromosomes and centiMorgans

I am very new to this so please be patient with me. I had a DNA test via Ancestry which didn't tell me very much and so I uploaded the data to GEDmatch. My top 3 matches are: A:11 chr matches, ...
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1answer
1k views

Working with autosomal DNA results

I have the automsomal DNA results for myself, 3 full sisters and 1 half-sister. We all share a mother, and we all tested with familytreeDNA. Our results are uploaded to gedmatch.com. Our parents are ...
8
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1answer
319 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, ...
8
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1answer
4k views

Which Gedmatch admixture calculators are most useful for an individual of predominately African American descent?

According to my Ancestry DNA autosomal test results, my admixture is 70% Sub-Saharan African, 25% European and 4% Native American. Which Gedmatch admixture calculators might I find particularly useful ...
7
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1answer
203 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....
7
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1answer
4k views

What DNA test does 23andMe perform?

What DNA test does 23andMe perform? I can't find it stated anywhere on the website. The FamilySearch Wiki appears to imply that they perform the autosomal test and use that to infer Y-DNA and mtDNA ...
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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 ...
7
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3answers
715 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,...
6
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4answers
23k views

Finding haplogroup through raw DNA data?

I just got my results from AncestryDNA. What are some ways to find my haplogroup through my raw DNA data?
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3answers
2k 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 ...
6
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3answers
21k views

How to interpret a reasonable X DNA Match, but no shared cM Autosomal result on GEDMatch?

I recently uploaded one of the Autosomal DNA results I manage to GEDMatch.com and ran the X-Match routine and came up with a puzzling result. The strongest result by far on the test has 37.2 shared ...
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3answers
4k views

Determining if an autosomal and X-DNA match is my half-sibling?

I am adopted and have info on my maternal side, but not paternal. I recently got a match through AncestryDNA with someone saying we were close relatives. This man and I share 2086 centiMorgans in ...
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2answers
1k views

Is this adopted DNA match my niece or half sibling?

The adoptee and I have an autosomal total segment of 2138.8 cM the largest segment is 122.6 cM. The X-DNA is 115 total with the largest segment at 95. My son matched the adoptee with autosomal 1124.1 ...
6
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4answers
909 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, ...
6
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1answer
552 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
289 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: ...
6
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1answer
237 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
92 views

When triangulation is not transitive

I'm focusing on triangulation groups and so looking at matching segments that overlap each other. I'm frequently finding the situation where, at a single website, match A's segment is shown as ...
5
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3answers
804 views

Determining where particular parts of ethnicity percentage from DNA come from in family?

I completed a DNA test, and the results stated that I am 77% African 20% European 2% Native American and 1% Asian. From the results of this test, is there anything in the results that would tell me ...
5
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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 ...
5
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2answers
2k views

Is the Autosomal DNA testing ever wrong on relationships?

I have done the Autosomal DNA test through Ancestry.com and uploaded it gedmatch.com. In Ancestry.com I matched several people that would be 1st or 2nd cousins. I also matched with them on gedmatch....
5
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1answer
74 views

Can the amount of saliva affect how many centiMorgans are shared between 1st cousins?

I share 279 centimorgans with a 1st cousin in 12 segments. I don't believe that is enough to be considered 1st cousins. She says she couldn't spit a lot. Would a small amount of spit affect the ...
5
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2answers
413 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, ...
5
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1answer
785 views

Why are the lengths GEDmatch.com Chromosome Segment Matching segments not proportional to their cM?

The GEDmatch.com Chromosome Segment Matching report has the following legend: One of my reports has the following triangulation match: The purple segment (< 5 cm) is 102912701 - 111046063 (4.189 ...
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1answer
277 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
743 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....
5
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1answer
169 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 ...
5
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1answer
318 views

Is there a tool to generate a parent's DNA sequence from their children's?

I have the DNA (via Ancestry DNA) of a mother and 3 of her children, one son and two daughters. I know I can get an approximation of the father's Y-chromosome from his son. Is there a tool to ...
5
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2answers
116 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 ...
5
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1answer
7k views

Distinguishing half sibling, uncle or half nephew using Ancestry DNA?

My husband did ancestry dna to find any info on his biological fathers side. He just got a “close family” match with whom they share 1440 cM across 49 segments. Is it possible to be a half sibling?...
5
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1answer
171 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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4answers
91k views

How long do results typically take for Ancestry DNA test?

I ordered a family DNA test from Ancestry.com and sent it in for lab processing, they received it and the web page shows: Test in Process: Lab processing began on 02/26/2015 It is now four days ...
4
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2answers
7k 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 ...
4
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3answers
527 views

Distinguishing half-brother from uncle when sharing 2,183 centimorgans?

Results from Ancestry show that I share 2183 centimorgans with a complete stranger who is my age. 1450-2050 centimorgans = grandpa, uncle, half-brother 2400-2800 centimorgans = brother I wonder if ...
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3answers
347 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 ...
4
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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. ...
4
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1answer
95 views

Distinguishing half siblings from cousins using AncestryDNA?

My husband recently took an AncestryDNA test to see if he could find out who his father was, at least through matches. His closest match that came up was a female who shares 1390 cms across 45 ...
4
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3answers
96 views

Reducing risk of confirmation bias with DNA test results?

This is a follow-up question to Using DNA to link individuals after a name change My cousins and I are pretty sure my great-great grandfather, Everett T Malcom, changed his name when he moved west. ...
4
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1answer
222 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 ...
4
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2answers
395 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 ...