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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2answers
507 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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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
2k views

What relation is my Half-Aunt to her DNA Matches?

I have recently discovered through an Ancestry DNA test + GEDMatch that my Aunt is my half-Aunt and that she and my mother don't share the same biological father. Looking at my Aunt's DNA Matches on ...
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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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1answer
326 views

Understanding AncestryDNA match of 1,866 cM if not Half Sibling?

I have somewhat recently started using Ancestry.com, so just a fair warning that I'm still learning how everything works! That being said, I am the child of my biological mother, who I know, and an ...
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2answers
578 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 ...
4
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1answer
1k views

What settings to use in GedMatch to confirm a seventh generation relative sharing DNA?

I have a relative, Nancy Ann Trigg, who is 7 generations removed from me, so I expect I have one part in 2^7 (128) of her DNA in my autosomal DNA test. I want to confirm this relation and found ...
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1answer
2k views

Is ancestry.com DNA test accurate with respect to native american descent?

Both myself and my wife believe we are descendants (each on the order of 1/16) of native americans, yet for the Ancestry.com autosomal DNA test, the ethnicity estimate shows nothing for native ...
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1answer
224 views

Interpreting matches with low cM values and high SNPs (or vice versa)?

On GEDmatch's autosomal one-to-one report, a match contains a column for cM and a column for SNPs values, for each of the matching chromosomes. Normally you look for high cM values as an indicator of ...
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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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2answers
114 views

What are the chances of having autosomal DNA from an ancestor N generations back?

I understand that everyone carries autosomal DNA from both their mother and their father. Because there are only a small number of crossovers per chromosome, I see that not everyone would carry any ...
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2answers
101 views

Not sharing any centimorgans with person who mother shares 102cM?

My mother (age 96) shares 102.1 cM with a man (age 72). However, I do not share any cMs with him. What could their relationship be and why don't I share any cMs with him?
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70 views

Adequacy of DNA evidence — how can I improve it?

Individuals H and J are 2nd cousins (supported by a strong documentation trail) who share two ancestors: John Charles Wright (circa 1830-1904) and Caroline Ellen Brown (circa 1827 – 1871). They share ...
3
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1answer
102 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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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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3answers
2k views

Is it possible to inherit the physical look of one ancestor specifically?

My family and I are Swiss, but my dad has a very Mediterranean look. His skin tends to be copper-coloured, he has very dark and very curly hair. This is especially obvious in photographs where he ...
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1answer
41k views

Why would Native American Ethnicity not show up in Autosomal DNA results?

My 3rd great grandmother was Muskogee. I have no Native American DNA according to ancestry.com, yet my DNA matches also share this ancestor in our family trees. Why, if we match DNA-wise and ...
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3answers
121 views

AncestryDNA showing No Match for Half Aunt?

My father's half sister just posted her AncestryDNA results. I did not come up as a match, nor did my sister. Does this mean that my father's dad is not really his dad, or could there be another ...
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1answer
209 views

How can 3/4 siblings share mother but not paternal ancestry?

My family is running the DNA test gauntlet and my dad got back some interesting results. He is related to his half sister (1,687 cM across 66 segments) at a level that is to be expected. He is ...
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1answer
95 views

Understanding relationship with Shared DNA of 1,911 cM across 62 segments?

I had a person contact me via Ancestry.com and we appear to be very close in ancestral background. She is 10 years my senior and appears that she could be a very close match with the following shared ...
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1answer
170 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
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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1answer
966 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
146 views

Understanding double cousins?

I’ve been trying to find out the identity of my grandfather for quite some time and recently, new DNA matches have meant it easier for me to narrow it down. I have 3 matches that are all descendants ...
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1answer
320 views

How could we be related. All combinations make zero sense

I the poster is K2 as related below Objective: Learn how T and G fit into the K's tree T&G appeared in DNA match with CM to K2 (K1 is still in testing) BackGround T and G are siblings born ...
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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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1answer
151 views

Understanding DNA results?

We are searching for my husband's father with nothing more than a name. We did DNA through Ancestry and the person we thought would be his half-sister Person 1 came back as his first cousin 1,187 ...
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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
257 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
377 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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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
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 ...
3
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1answer
319 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, ...
3
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2answers
149 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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1answer
72 views

Placing adoptee in family tree when What Are The Odds cannot help?

I am trying to figure out where an adoptee fits in my family tree. I know he are is related on his paternal side, since his maternal side has been identified and is not related to my family. I have ...
3
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1answer
68 views

Creating a phased DNA kit using grandparents' kits?

I was lucky in that I was able to DNA test both paternal grandparents, as well as my maternal grandmother before she died last year. I have also tested my mother, but unfortunately my other ...
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1answer
72 views

Brother/sister have fully identical segment — match only matches one of them on that segment

Using David Pike's tool: https://www.math.mun.ca/~dapike/FF23utils/pair-comp.php I found that my mother and her brother are fully identical on the portion of chromosome(s) 4 from position 122.2 ...
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1answer
251 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 ...
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2answers
437 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 ...
3
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1answer
429 views

Calculating the relationship from the RAW autosomal result file between two individuals?

My question is about the Ancestry Genealogy tests (Autosomal DNA tests) being offered. Suppose a consume DNA testing service company, like 23andMe/Ancestry.com/FamilyTreeDNA, extracts two people's ...
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1answer
85 views

Calculating segment cM from 23andMe matches?

Going through my list of matches I'm working on a triangulation analysis. (Such that if person A matches from position 10-15 and person B matches from position 10-13 I can break out position 10-13=A&...
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4answers
2k views

Can half siblings share no common DNA?

My half sister and I share the same father, but different mothers. Because my paternity was questionable we both did an Ancestry DNA test....I matched to relatives of my grandmother and she didn't.......
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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
636 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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0answers
104 views

How to completely upload an “Everything” kit created from Dante Labs to GEDmatch?

I have Dante Labs WGS kit for which, using WGS Extract, I created an everything kit for GEDmatch. When I uploaded it as other since Dante Labs is not an option, it was identified as being "23andMe ...
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3answers
26k views

Possible half-sibling based on matching Centimorgans

I have been using Ancestry.com for years. A year back I submitted my DNA test. I have had quite a few matches that land in the distant relative to 3rd or 2nd cousin range. Recently, I was notified ...
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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 ...
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2answers
2k views

How much DNA would match a 5th cousin once removed?

I have 5 autosomal DNA tests (from cousins and siblings of each other) that are theoretically all 5th cousins, once removed, from another DNA test. Using GED Match autosomal compare, I found these ...
2
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1answer
70 views

How do descendants of twins affect DNA matching?

With respect to AncestryDNA matching. Could a child of an identical twin match a first cousin at a half sibling range? My friend has suspected her grandfather isn't her biological grandfather. DNA is ...