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
194 views

How many centimorgans should I share if second cousins marry?

My first cousin's daughter had a child with my sister's son. The child was given up for adoption. I'm matching someone on Ancestry.com with 1124 centimorgans. Not sure if this is the child and cannot ...
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1answer
116 views

Understanding second cousin match on AncestryDNA?

I am a little confused. I have a match on Ancestry.com...who by the way doesn't answer my emails which is incredibly disappointing as he is the closest match I have ever had and I've been on FTDNA for ...
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3answers
119 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. ...
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1answer
72 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 ...
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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
58 views

I don't know who my dad is but I have DNA paternal matches

I have DNA matches on Ancestry.com but none high enough to be my father. However, all the matches point to a common name as our ancestor. The highest match is 959 over 42 but the person it matches ...
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2answers
102 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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1answer
198 views

Does AncestryDNA match of 1,697cM indicate half sibling or aunt?

I just received my AncestryDNA results. It shows I have a close family match with a woman who would be my grandmother, aunt, or half-sibling. We matched 1,697cM with 51 shared segments. It cannot be ...
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1answer
235 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
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
2k views

Why would my Full sibling results 99.7% be so close to my half sibling DNA result 99.6% with my sister

I recently had sibling DNA testing done with what I thought was my half sister. Our full sibling results were 99.7%. And our half sibling results were 99.6%. I called Genex the company that did the ...
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2answers
118 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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1answer
58 views

Match to a man and his daughter, but not his grandson

My father and I have a DNA match to a cousin but my son does not. How is this possible?
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1answer
58 views

Deducing relationship from DNA results for two matches at two different websites?

My father was adopted and, while I’ve had my DNA tested, he is not quite ready to do so. I’ve found some fairly close matches, one that shares 9.8% (692.7 cM) and another that shares 14.4% (979 cM). ...
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1answer
107 views

Understanding close family match from AncestryDNA?

I took the AncestryDNA test. It came back with: Close family male, 2022 cM shared across 60 DNA segments. 1st cousin match female, 1194 cM shared across 48 segments. It turns out the female 1st ...
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3answers
62 views

DNA match higher with a younger generation of the family

I have a 107 cM match with Eli. His mother is Lily and Lily's brother is Henry. Henry's son is Henry Jr and his grandson is Kevin. I have a 235 cM match with Kevin. Kevin is one generation younger ...
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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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2answers
125 views

Understanding second cousin predictions from AncestryDNA?

I have three extremely high second cousin predictions from my father's side. I do not know my anything about my biological father (Name, age, etc..). My top matches are: R - 619 cM across 39 ...
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1answer
95 views

What is family connection for 1722 cM match?

I have a DNA match with a man that AncestryDNA discovered. The match is DNA 1722 cM across 62 DNA segments. I have messaged the guy to try and talk with him and discover how we are related. He seems ...
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1answer
92 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 ...
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2answers
1k 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,...
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3answers
2k 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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2answers
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 ...
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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 ...
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1answer
98 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
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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3answers
759 views

Is this Match a Half Niece or a Second Cousin?

A DNA match for a woman has shown up on my Ancestry DNA as a second cousin with 490 cM. I recently discovered that I am thought to be the half sister of this woman's mother. My full sister shares 446 ...
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2answers
124 views

Explaining how all DNA matches are shared with Half sibling?

I have DNA matches from Ancestry, FTDNA, GEDMatch, and My Heritage. My half-sister also tested with Ancestry. It confirms we are half siblings and share the same mother. I do not know who my father ...
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2answers
144 views

Understanding high match on autosomal and X dna?

I have an autosomal match of 1125 centimorgans with largest cm of 128 and a X dna match of 108 with largest cm of 67. 1 8 generations apart. The lady I match to was adopted and knows nothing of her ...
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2answers
341 views

Confirming possible half sibling from AncestryDNA?

It took a few months to process this shocking news from my dna results from ancestry. I am a new at this & did the test with my daughter for fun. Imagine my surprise when someone contacted me ...
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0answers
98 views

Interpreting runs of homozygosity data to determine how closely parents were related?

According to Gedmatch's Are your parents related? tool, my grandmother's DNA shows several runs of homozygosity (ROH): Chr Start Location End Location Centimorgans (cM) SNPs 3 180690286 ...
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3answers
278 views

Sharing more autosomal DNA with second cousin's child than with second cousin?

In my shared matches on AncestryDNA I am used to seeing matches to the children of my 2nd cousins that are less than the match I am to their parents. However, when examining my sister's DNA I see ...
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2answers
102 views

Triangulation with DNA Results - is something amiss?

My 1st cousin 1xR and my Aunt and I have all taken Ancestry DNA tests. For clarity sake I will refer to the parties as "Z", "N" and "R" "R" is related (by document) to "N" as nephew and Aunt "Z" is ...
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2answers
93 views

3rd cousin DNA match not matching either parent?

I am having trouble figuring this out. A 3rd cousin popped up with 117 cMs shared across 6 segments via Ancestry DNA. She is not a match with my Mom and there is not a common match with my dad's ...
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1answer
51 views

Is further testing needed to determine half sibling?

On a DNA match I have a 'close relative' that came up matching 2039 Cms across 58 segments. Do we need to do more testing to determine if we are definitively half siblings?
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2answers
906 views

Is DNA match 1st cousin or niece?

I have recently learned that my father is not my biological father. Please see the Ancestry DNA screenshot. The first person in red is listed as a first cousin but I know for a fact she is actually ...
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1answer
324 views

Identifying maternal grandfather through autosomal DNA testing?

How can I identify who my maternal grandfather was through autosomal DNA testing? My mother was born in 1928 and is deceased. She had no full siblings. I have taken a DNA test on Ancestry.com, ...
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1answer
44 views

Understanding Half Siblings and Half Cousin terminology?

My mother was adopted and recently I was able to connect the dots and locate her birth families, so now the fun begins. I am confused in regards to the situation of a person having 3 paternal siblings ...
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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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4answers
397 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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1answer
97 views

Are centimorgan contributions additive?

I share a 50 centimorgan 6 segment match to person "J". My maternal side aunt shares 54 centimorgan 5 segment match to that same person "J" I see two possible blood-line connections between my aunt ...
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1answer
1k views

Ancestry Ethnicity says I'm 100% Irish and Scottish?

Can you explain how I can be 100% Ireland and Scotland in my Ethnicity estimate on Ancestry? Why not 99% Ireland and 1% Scotland, how can it be 100% both?
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1answer
131 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 ...
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0answers
39 views

Using Collaborator status of AncestryDNA to see tree owner's shared matches to one of their matches?

At AncestryDNA, about two months ago, my sister set me as a Collaborator on her DNA test which is linked to my tree, and I just checked to see that I still have that Collaborator status, and as far as ...
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1answer
153 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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0answers
61 views

Dealing with sibling surprise?

My Husband's DNA through Ancestry.com shows his first match at 1922cm's over 45 segments. This person has a small tree (750 names) going back about 4 generations. My husband also matches 5 other ...
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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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2answers
101 views

Confirming a connection

Ancestry connected me with 2 people that are siblings, (Unknown to me) .Our DNA match between me and the other 2 is 850 and 971 CM respectively. They are 10 and 20 years older than me as well. Based ...
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3answers
205 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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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 ...