Questions tagged [dna]

For questions about using DNA to further knowledge of family history, relationships, ethnic origin, and overall ancestry. Most common tests include Y-DNA, mitochondrial DNA, and autosomal DNA.

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4
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1answer
462 views

DNA Sticky segments

We have identified a group of over 40 people who match at the same place on chromosome 5. The matches usually range from 10-25 cMs with one match to me being 47. About half of the matches start at ...
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2answers
94 views

Isolating DNA segments related to specific ethnicity-location

Almost all genetic genealogy websites will tell you the origins of your DNA. But I would like to go one step further and find out which parts/segments of my DNA are related to a specific ethnicity. I ...
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4answers
2k views

Half Sibling DNA not matching?

My half-sister and I recently completed DNA tests with myHeritage.com. The results don't show us having matching DNA. We share the same father. Is it possible that we are half siblings even though ...
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4answers
425 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 ...
1
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1answer
155 views

Cherokee and Irish DNA

I just got my dna results back. Very interesting. But my great-grandmother was 100% Cherokee and her husband was Irish, directly from Ireland. My mother receives a check from the Eastern Band, the ...
3
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1answer
117 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 ...
3
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3answers
30k 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 ...
3
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1answer
5k views

Understanding X-DNA match from GEDmatch?

I have a cousin who we are trying to figure out our X-chr but I have not understood this from the beginning. Can someone explain this chart to me? I'm going to post the chart for you to look at so ...
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1answer
407 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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1answer
1k views

How does the GEDMatch Relationship Tree Projection Tool Work?

This is an advanced question. I know how to use the tool. A good answer will explain how it does what it does. An ideal answer would come from the person who wrote the tool for GEDmatch. The purpose ...
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2answers
965 views

Match on Autosomal DNA but no match on X chromosome

I am very new to genealogy and I am hoping someone can advise me. Having uploaded my gedcom to Gedmatch, my best one-one match on Gedmatch is with someone who matches on Chr 8 (14.4 cM) and Chr 11 (30....
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2answers
643 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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1answer
1k views

1st cousin match on 23andme.com no shared x chromosone

Two females tested on 23andme.com and come up as a 1st cousin match of 11.2% of their DNA. They share zero X chromosomes with each other. Does this mean they are related to through their mothers and ...
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2answers
587 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 ...
3
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1answer
2k 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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4answers
1k views

Acceptable number of no-calls in autosomal DNA test results?

Using Gedmatch's file diagnostics, an autosomal DNA test kit I manage shows that there are 31200 (4.4%) no-calls. In most matching algorithms, a no-call is treated equivalently to a match. Therefore, ...
3
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2answers
851 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 ...
5
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1answer
199 views

Autosomal DNA: Can I tell who is the parent and who is the child?

I have two people who have both autosomal DNA tested. I have both of their match lists which contain all the people each of them matches to. For each person that each of them match to, I have: The ...
5
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1answer
328 views

Is DNA match between two parties that ought not be related by “blood” possible?

I recently completed a autosomal DNA through ancestry. They reported that I had a possible match to another ancestry user with: 30.0 centimorgans shared across 1 DNA segment However, it turns out ...
4
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2answers
212 views

Identifying John Morgan, son of Thomas D. Morgan (1809-1870)?

I have a real dilemma. I have found a DNA link to the Thomas Morgan (1791-1860) family through Frances Denira "Fanny" Morgan (1821-1899), daughter of Benjamin Francis Morgan (1762-1835), who was the ...
3
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3answers
5k 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 ...
3
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1answer
91 views

Location of centromeres in humans

I am creating a visual representation of which chromosome portions I inherited from each grandparent. It would be helpful to include the centromere location as part of the visual representation, like ...
3
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2answers
182 views

mtDNA Match Discrepancy

At Family Tree DNA, I did the mtFull Sequence test. I have 1,000 matches that include 284 exact matches at GD 0 for my haplogroup K1a1b1a which is a common haplogroup for Ashkenazi. My Uncle (on my ...
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1answer
2k views

Does 5.1% Ashkenazi Jew from DNA count as Jewish ethnically? [duplicate]

If I'm 5.1% Jewish, how far away are my Jewish ancestors and do I count as a person of the Jewish race ?
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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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0answers
124 views

When the same name or family comes up in ancestors of DNA matches

I am pouring through the family trees of my DNA matches on both GEDMatch.com and Ancestry.com and, while it hasn't helped me solve any road blocks yet in the 2 years since I tested myself, I have ...
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2answers
681 views

Am i half mexican?

My mother has high yellow skin and light eyes and so does my grandmother. My aunt recently researched our family history and discovered that my great- grandfather was half Mexican. but that's not ...
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3answers
157 views

Understanding whether AncestryDNA ethnicity result indicates being Multiracial?

I did an ancestry DNA test to find out my ethnicity. Obviously I'm African-American, but the test revealed to me that there were five different ethnic groups running through my blood and they were ...
3
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2answers
238 views

Understanding DNA test results for aunt

My maternal aunt sent me her mtDNA test results. How can I relate this to my own ancestry? If her mtDNA falls 15% within a certain country, what percent of my DNA would also fit there?
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1answer
433 views

DNA test to prove/disprove blood relationship going back ten or twelve generations

On my mother's side I am related (in Southern Germany) to the B. family. My grandfather collected data back as far as my 10G-grandfather. I know nothing about his parents, although there is an old ...
4
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1answer
690 views

Determining 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? For example, a 2,200 cM match suggests it could be either: ...
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2answers
71 views

Differences in Half-Sibling Matches

This is a follow up to Probability of Specific Relationship from AncestryDNA? I have an Ancestry match with two half-sisters (same mother, different fathers). The older one by 16 years matches me ...
3
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1answer
464 views

Derived vs Ancestral

If an SNP is "not derived", then its considered negative and "ancestral". What does "ancestral" mean in this context? Wouldn't an "ancestral" result be better than a derived result as I assume "...
0
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1answer
113 views

98% European 2% Northern African

How far back would the ancestor have to be for me to have 2% African? There is a family story that we are decended from a brother who made some "poor choices' and was disowned from the family. I ...
3
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2answers
253 views

Probability of Specific Relationship from AncestryDNA?

I have a DNA match on Ancestry.com that shows a possible 1st or 2nd cousin match at the level of 684 cM's (just barely inside the 680 - 1150 range) and across 29 strands of DNA for 1st cousin. There ...
3
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2answers
647 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
1k 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
277 views

DNA tag disappears after tracing many generations back?

When I trace an ancestor back, back and back, suddenly, my DNA link disappears, it's as if one of many greats grandparent misbehaved. I don't think Roger William was misbehaving, but my DNA disappears ...
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1answer
99 views

Understanding Identical mt and Y Haplogroup with adopted man my parents age?

I'm 35, female. I had a 23andMe DNA profile for the past year, and I met a 59 year old man (Jay) who shares the same maternal haplogroup, who was put up for adoption in a Brooklyn hospital and is ...
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1answer
906 views

Understanding shared centimorgans if siblings have child?

If siblings have a child together how many centimorgans would that child share with their 1st cousin from the same blood line?
3
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2answers
1k views

Clarifying autosomal DNA match that suggests Half Sibling relationship to aunt?

I am having a difficult time understanding everything and quite frankly am overwhelmed with the thought of the "possible" outcome I am facing. My parentage as far as my father is concerned is ...
3
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1answer
86 views

Maternal or paternal connection?

23 and me said I was a match on my maternal side to a 1/2 brother - we were both adopted to different families and are trying to find out which side we've matched from. I'm U5b2a2 and he is X2c1 - ...
2
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1answer
265 views

Seeking books on individual haplogroups?

Are there any books on individual/collective haplogroups? There's a lot of poison in genetic forums, and I prefer the unbiased scientific explanation for what's known and not speculated.
3
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2answers
394 views

Finding paternal family using DNA?

My brother and I are in our seventies and recently found out we are full siblings through DNA testing. We do not know who our father was. We have DNA matched with a possible 3rd cousin. I have ...
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3answers
522 views

Does having child of DNA tested parent help find parent's DNA ancestors?

If a parent (Charlie, a male) has been autosomal tested, and does not have either of his deceased parents (Alice and Bob) tested, and thus he does not have his autosomal DNA phased between their ...
3
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1answer
156 views

Finding out the ethnicity of your DNA matches?

I've seen people discussing things like "I'm English but I have a bunch of Polish matches" with regard to DNA genealogy. How exactly do you go about finding the ethnicity of your matches? By ...
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1answer
103 views

Nat Geo result puts paternity in doubt

Nat Geo DNA test shows brothers with different paternal ancestry. One is R-Z220, the other is R-L21. Does this indicate the brothers have different fathers? The overall regional history is different ...
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3answers
150 views

DNA question on %.

My mom is 30% Spanish my dad doesn't have any Spanish. I'm 29% Spanish. ( (We all took the DNA test) how can I be just as Spanish as my mom if my dad wasn't at all? shouldn't I only be 15%?
5
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2answers
193 views

Explaining risks when seeking DNA testing by cousin?

It has recently occurred to me that I have been in intermittent contact with a second cousin who shares my father Y-DNA (subject to any mutations in the last two generations, which should be slight). ...
1
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1answer
2k views

Distinguishing Half Siblings from First Cousins using DNA?

My husband is adopted and we were given non identifying information by the adoption agency. After doing a DNA test on ancestry we have found his mother, unfortunately she is not open to sharing any ...

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