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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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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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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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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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
4k views

Half siblings using cMs (centimorgans)

I used ancestry to obtain my results. I found my 1st cousins and aunt on my father's side. The process of elimination resulted that this one young lady has to be my sister but she came up my 1st ...
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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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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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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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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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2answers
664 views

Does 1,366 shared cM indicate half-siblings?

I recently did Ancesty DNA to determine a match between me and a possible half sister. The results came back, and we share 1,366 cM of DNA. As I’ve learned, this is on the low side for half siblings ...
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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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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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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
339 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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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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2answers
2k views

Is this close family member on AncestryDNA a half sibling?

on ancestry.com i got a "close family" match, with 1,430 centimorgans shared across 58 DNA segments - it says it could be a niece, aunt, or half sibling (range includes 1st cousin, but i have read ...
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2answers
247 views

Estimating centimorgans of shared autosomal DNA between female and half paternal brother?

I am a female. My half paternal brother and I share 328.7 centimorgans across 13 dna segments. Is that possible, or should the numbers be higher?
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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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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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3answers
413 views

Are 1,053 shared cM likely to be a cousin or a half sibling?

I found a 1st cousin not connected to my mom and my dad was an only child. She has 1053 cM on 40 DNA segments. I have heard people say 1st cousins can also be half-siblings? If she is a first ...
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1answer
959 views

Can half-siblings show different relationships to extended family?

My husband has found a half sibling, first on Ancestry showing a match of 1542 cm over 77 segments, and then confirmed on 23andme with a suggested relationship of "half sibling". Ancestry only showed "...
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2answers
563 views

Different genetic relation strength through maternal vs paternal line?

Is there a different genetic relation strength through maternal vs paternal line? In other words: am I more related to my mother than to my father or are they exactly equal? Or another way to ask it ...
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2answers
85 views

Distinguishing relationships based on DNA numbers and age difference?

I recently joined Ancestry and received several first to second cousin matches, all from what appears to be the same family. The strongest match is 1070 centimorgams and 45 segments. This woman is ...
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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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1answer
264 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....
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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
171 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
153 views

Tracing African relative based on autosomal DNA results?

I DNA tested my 3 children and one son shows as 1% Benin/Togo, my ex-father in law has also tested and he shows having SE Bantu. I am guessing 1% means about 10 generations back? Between my ex-in laws ...
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1answer
262 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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1answer
114 views

Needing further testing to determine half-sib status?

Another AncestryDNA user and I share 1,792 centimorgans across 49 DNA segments. The back story is that I'm a sperm donor baby and this user's father was a donor at the same clinic in the same time ...
5
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2answers
130 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 ...
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1answer
126 views

Half brother and sister related to other family?

After taking an AncestryDNA test, I matched a half brother, who I'll refer to as Y to preserve privacy, and sister, who I'll refer to as X. Both appear to come from the maternal side (both adopted ...
0
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1answer
129 views

Helping my son find his unknown biological father

My son's biological father and his family is unknown. Both my son and I took Ancestry DNA tests. Then I went through his matches for "shared matches" - if I didn't show up, I assumed the match was ...
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0answers
679 views

Is the relationship an aunt /niece or half sister to my mother?

I am a genetics beginner: A little back story: My mother was adopted at birth. She found her birth mother and siblings back in the 90s. The birth mother was deceased at the time, and we also ...
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3answers
489 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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1answer
302 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 ...
5
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1answer
438 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
574 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, ...
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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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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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3answers
2k views

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 ...
3
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1answer
103 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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3answers
99 views

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 ...
3
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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 ...
5
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1answer
9k 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?...