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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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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474 views

My Full DNA: Whole Genome Sequencing with mtDNA from dante labs

I have done 23andme. And I see there is a 23andme tag and an Ancestry.com tag. I have just come across an ad from Dante Labs for "My Full DNA: Whole Genome Sequencing with mtDNA." While I have a PhD ...
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2answers
153 views

How can overlapping ~35 cM segments of matching kits not match each other?

How can overlapping 36.8937 cM (from 11,551,254 to 48,458,402) and 82.9541 cM (from 12,460,601 to 74,135,725) matches on Chromosome 18 not match each other? On GEDmatch, I compare Alice to Bob and ...
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4answers
7k views

Could a first/second cousin DNA match actually be my half brother?

I was adopted at birth and know very little identifying information about my birth parents. I recently took a DNA test on Ancestry.com and found a match that was a possible 1st/2nd cousin match. ...
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3answers
761 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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1answer
891 views

Finding my Great-Grandfather when DNA test not conclusive?

I am from Japan and I have been trying to identify my great-grandfather who was British. For more background these are two questions that I have asked here previously: Finding UK record(s) of ...
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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
543 views

53 Segments of DNA

I share 53 segments of DNA with a relative. I’m currently not sure of my exact relationship with them however, but Ancestry.com shows us as cousins with confidence being extremely high. This person is ...
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1answer
162 views

Matching unknown family member apparent from AncestryDNA?

I had my DNA test done on Ancestry, when I received my results I showed a 1051 CM match to a Sandra. I knew nothing of this person nor could we find any connection. This person lives in Wales. Rumor ...
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2answers
137 views

AncestryDNA is changing again? What's going on? (July 2020 edition)

AncestryDNA is changing the way they match users, and which matches will be shown to you. Matches that share 6 to 7.9 cM will be eliminated. In addition, since AncestryDNA rounds up segments from 7.5 ...
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69 views

Understanding shared DNA of 1,576 cM with great nephew

I had my DNA tested through Ancestry. About a year ago, my great nephew (I'll call him GN-1) whom I raised had his tested. The match came up Close Family–1st Cousin Shared DNA: 1,576 cM across 69 ...
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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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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
659 views

High match on autosomal DNA, but no X DNA match to mother's half sister

The son of my wife's half-sister recently uploaded his DNA (from Ancestry) to GEDmatch where my wife's DNA (from 23andme) is already recorded. There was a high (846cm) autosomal match, but ZERO match ...
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1answer
1k views

What would the starting shared cM number be for abnormally close relationships in Autosomal DNA test?

I have seen in the examination of family trees where individuals sharing a great grand parent marry and have children, somewhat commonly in pre-American Civil War, which I would think would create ...
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1answer
81 views

Evaluating half sibling using AncestryDNA?

Recently we (two full sisters and a full brother) think we may have found a half brother who is 50 years old on Ancestry DNA, where he is being categorized as Close Family-First Cousin. sister 52yr ...
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2answers
145 views

Determining if 1,814cM match from AncestryDNA is Half Sibling?

My son recently had a match come up as close family the match is male and 1814cm. His only living grandfather is already in our tree at 1857cm. All other grandparents are deceased and have never ...
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1answer
115 views

Interpreting MyHeritage DNA Match of 973cM?

I just got a DNA match at MyHeritage with 973 cM, in common, which says first cousin. My mother had one brother, and it's from her side of the family. He had a son, who passed at a young age. I am ...
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1answer
155 views

Is a 12 CM 1 segment match better evidence for a common ancestor if it's otherwise unlikely?

Early in my research, I had guessed that the Samuel Price listed in the 1850 census for Minersville, Schuylkill County, Pennsylvania (my gg-grandfather's brother) was the same person as Samuel Price ...
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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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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
911 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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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
279 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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1answer
236 views

Why might number of Shared Ancestor Hints go down on AncestryDNA?

I only received my AncestryDNA results a few weeks ago, and so I am still learning about its functionality. One of the options that I find the most useful is its Shared Ancestor Hints because these ...
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1answer
17k views

What is expected shared cM of cousins with only one shared grandparent?

Related to What is expected shared cM of double third cousins?, what would the expected range and average shared cM be? In this case, I'm seeing 64.0 cM over 3 segments. Looking at the table, that ...
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1answer
262 views

Child of possible incest

My sisters, two aunts and several cousins (on maternal side) did the 23 and me DNA test. One of my aunts (the younger one) showed up as a half sister to me (we share 1,942 cM and 44 segments) and my ...
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1answer
61 views

X-DNA and Half Sister

I am a female. Another female and I have come up as sharing 1915 cM's and when we do the one to one X-DNA on GED Match, if we click on "prevent hard breaks", we have a straight blue line across the ...
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1answer
119 views

Can 419 and 468 shared cM indicate first cousins?

I was adopted and have known my birth family for many years. I just did a DNA test and found I have 702 matching cM's with the daughter of my mother's brother (making her my 1st cousin). This helps ...
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1answer
83 views

Possible family relationship with 3rd cousins

I have three 3rd cousins on my mother's side with 66.1-71 cM shared between us. One is male and 2 female. These 3 cousins are 2nd cousins to each other and I believe I am their third cousin. They ...
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1answer
2k views

Distinguishing half sibling from niece/nephew using AncestryDNA?

I did the ancestry DNA test and also uploaded my raw data to GEDmatch. I have located two close family matches and I'm wondering how to find out how close we are. Either half siblings or niece/nephew. ...
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2answers
137 views

Can Origin of Spanish DNA from 16th to 18th generations be traced to historical events?

DNA on Ancestry & GEDMatch -- I find a bit of Spanish with a dash of some Mediterranean groups all dated to 16 or so generations back. Else all British Isles with another dash of Northern ...
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1answer
2k views

How do I determine our common ancestor?

I'm trying to find a match for DNA that is narrowed down to go through my dad's line and another person's paternal line. I'm thinking if I could compare our fathers' pedigree surnames it might reveal ...
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46 views

Have I found both biological parents, one biological parent or should I keep looking?

My husband's mother was adopted without any records (1910 NYC). I located her biological paternal family along with several possible brothers through DNA. I cannot locate her biological maternal ...
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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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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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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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1answer
130 views

Visualising genetic distance information from personal genetics sites

I've been using 23andme.com it shows me a comparison with genetic relatives and lists our common relatives. I have over 1000 3rd, 4th and distant cousins on 23andme. Is there are way to make a ...
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0answers
346 views

Autosomal DNA Chromsome Browser - Is there such a thing as a 'family trait' of shared segments?

I realize the passing of genes is approximately 50/50 (reference Generational Loss of Data with DNA testing) with each generation and which genes are passed are commonly referred to as 'random' based ...
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1answer
350 views

Why no DNA match with possible seventh cousin?

Working on my geneology family tree I discovered my 6th generation grandfather link with another person. I had a DNA test and no match came back with the other person who also had DNA test and I have ...
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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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1answer
63 views

2nd cousins. One 4%, one 8%?

I’ve recently been matched to two second cousins by DNA. However one shows a 4% match and the other one shows an 8% match. One is on my father’s side and one is on my mother’s side. Why, or how is ...
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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 ...
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2answers
109 views

Interpreting ethnicity from DNA testing

Ancestry DNA testing confirmed that I am 23% Chinese. My mother has no Chinese DNA. My fathers mother has no Chinese DNA. Does that mean my father is 50% Chinese and his father is 100% Chinese? ...
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3answers
109 views

Contacting AncestryDNA match?

I have a match on Ancestry.com with someone who I believe is a nephew who was given up for adoption. I sent 3 messages through Ancestry.com but no response. Do you know of any other way to contact ...
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1answer
141 views

Is AncestryDNA match of 2,063 cM a half sibling?

I am new to AncestryDNA and my results came back with my top match having 2,063 centimorgans out of 62 segments saying close family. Would this be a half-sibling? The match is a few years older ...
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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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469 views

Why is the total shared Centimorgans 52.7%?

Can you please tell me what I have done wrong in my calculation? I added all the Centimorgans from my Gedmatch chart and it gave a total of 3587 which is 52.7% It should have been 50% only. The ...
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103 views

Intrepretation of DNA detectable relationships

While quite a number of questions have been asked and answered regarding DNA and relationships, I'm not certain that this question has been asked. I have a 5th cousin that has been identified by ...
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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 ...