Genealogy and Family History Stack Exchange
Genealogy and Family History Stack Exchange

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.

282 questions
9
votes
4 answers

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, who was there for my birth. None of her family…
luv2rgu28
  • 93
  • 4
5
votes
3 answers

Clustering of DNA regions at the grand-parents level

My father is born of unknown father and did a 23 and me DNA autosomal test. I thought I could use this test to potentially identify some relatives on this side but only very distant ones (at best 3rd cousin) could be matched. In order to split the…
C. V.
  • 53
  • 4
3
votes
2 answers

An Odd Set of cM Match Amounts

I can't resolve why the following strange set of match results is occurring. We have a fairly simple set of known relationships as shown in this tree: All the DNA Testers are shown in green. Jenny and Don are 2nd cousins once removed (2C1R) and…
lkessler
  • 16,677
  • 2
  • 25
  • 81
3
votes
2 answers

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 DNA from an ancestor several generations back.…
Ellen Spertus
  • 2,219
  • 9
  • 28
3
votes
2 answers

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 223cm of DNA which is comfortably within the…
user6485
3
votes
1 answer

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 19/17 and brother:January 16/18. Our younger…
D. Edwards
  • 51
  • 3
3
votes
1 answer

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 one matches 206 cM with the longest block being…
Mary
  • 31
  • 2
3
votes
1 answer

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. I am trying to determine my relationship with…
Cheryl
  • 51
  • 3
2
votes
1 answer

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 paving the way for her suspicions to be true. Her…
Kline716
  • 21
  • 1
2
votes
1 answer

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?
Gail Evans
  • 21
  • 1
1
vote
0 answers

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 people in this persons father's family... 3 first…
Lynda Wright
  • 11
  • 1
1
vote
3 answers

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 possibility that she is immediate family and in fact a…
user7718
  • 11
  • 1
  • 2
1
vote
3 answers

Missing expected Norwegian ethnicity in Family Tree atDNA results?

I just received my Family Tree atDNA results which show 97% British Isles. This seems to be a major error because it shows my Dad's lineage (BI) but completely leaves out my mother’s lineage which is all Norwegian documented to the 1600s. But the FT…
Lani
  • 11
  • 2
1
vote
1 answer

Using AncestryDNA to verify biological father?

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 the Largest segment = 75.3 cM Total of segments >…
Tanya Henman
  • 11
  • 1
0
votes
1 answer

Aunt or Half Sibling?

We tested a potential Aunt for my husband and the results came back 1992 Cm. We know this falls into the range we expected however, I immediately realized she has matches that she doesn't share with my husband the first closest unshared match being…
Jen
  • 1
1
2