Help:DNA Confirmation

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Categories: DNA

If you have taken a DNA test for genealogy and you have matches, you may be able to mark some of your ancestors as "Confirmed with DNA" — and start seeing DNA-confirmed.gif on your family tree.

Contents

Which Instructions Should You Follow?

→ What type of DNA test is it?

1.a.) Autosomal (the most common)

If your match is from a Family Tree DNA Family Finder, 23andMe, MyHeritageDNA or AncestryDNA test skip to the next question.

1.b.) Y-Chromosome

If it's a yDNA match click here: Y-Chromosome Confirmation.

1.c.) Mitochondrial

If it's an mtDNA match click here: Mitochondrial DNA Confirmation.

→ → Is the match between third cousins or closer?

2.a.) Yes

If it's autosomal DNA test match between two people who are third cousins or closer skip to the next question.

Note that a third cousin once removed is beyond a third cousin, but a second cousin twice removed is not. See this cousin chart.

2.b.) No

If the match is beyond a third cousin, click here: Autosomal Triangulation.

If you and your match are both men also see X-Chromosome Confirmation.

→ → → Which company is providing the autosomal match?

3.a.) Family Tree DNA Family Finder

If the matching test takers match one another on Family Tree DNA's Family Finder test, click here: One-to-One Family Finder Confirmation.

3.b.) 23andMe

If the matching test takers match one another on 23andMe, click here: One-to-One 23andMe Confirmation.

3.c.) AncestryDNA

If the matching test takers match one another at AncestryDNA, click here: One-to-One AncestryDNA Confirmation.

3.d.) MyHeritage DNA

If the matching test takers match one another at MyHeritage DNA, click here: One-to-One MyHeritage Confirmation.

3.e.) GEDMatch

If the matching test takers match one another on GEDMatch, click here: One-to-One GEDmatch Confirmation.



Instructions

One-to-One Family Finder Confirmation

If you know the relationship to be a third cousin or closer through traditional genealogy and the predicted relationship range in "Family Finder Matches" says your match could be a third cousin or closer, see the DNA Confirmation Example for a walk-through of which relationships can be confirmed and how to mark them.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA, using Family Finder Matches:

* Maternal relationship is confirmed by a 1417.42 cM Family Finder match between [[Roberts-7085|Peter Roberts]] and his maternal uncle [[Dekle-6|Dekle-6]].

If your match is not a third cousin or closer, see Autosomal Triangulation.

One-to-One 23andMe Confirmation

If you know the relationship to be a third cousin or closer through traditional genealogy and the predicted relationship range in TOOLS > DNA RELATIVES says your match could be a third cousin or closer, see the DNA Confirmation Example for a walk-through of which relationships can be confirmed and how to mark them.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA, using 23andMe matches:

* Maternal relationship is confirmed with a 23andMe test match between [[Whitten-1|Chris Whitten]] and [[Nally-4|Rebecca (Nally) Syphers]], first cousins once removed. Predicted relationship from 23andMe: "1st to 2nd Cousin based on 6.68% DNA shared across 21 segments."

If your match is not a third cousin or closer, see Autosomal Triangulation.

One-to-One AncestryDNA Confirmation

If you know the relationship to be third cousins or closer through traditional genealogy, and the match at AncestryDNA in the "3RD COUSIN" group or closer, see the DNA Confirmation Example for a walk-through of which relationships can be confirmed and how to mark them.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA using AncestryDNA:

* Paternal relationship is confirmed with an AncestryDNA test match between [[Whitten-1|Chris Whitten]] and [[Bartlett-34|Hollis Bartlett]], second cousins. Predicted relationship reported by AncestryDNA: 2nd Cousins based on sharing 150.3 cM across 9 segments; Confidence: Extremely High.

For an explanation of how to find the number of shared cMs at AncestryDNA see AncestryDNA's amount of shared DNA feature.

If your match is not a third cousin or closer, see Autosomal Triangulation.

One-to-One MyHeritage Confirmation

If you know the relationship to be a third cousin or closer through traditional genealogy and the predicted relationship range in "DNA Matches" says your match could be a third cousin or closer, see the DNA Confirmation Example for a walk-through of which relationships can be confirmed and how to mark them.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA, using MyHeritage matches:

* Maternal relationship is confirmed with a MyHeritage test match between [[Brown-8212|Abby Glann]] and [[Hols-14|Victoria Hols]], second cousins once removed. Predicted relationship from MyHeritage: "1st cousin twice removed to 2nd Cousin twice removed based on 2.0% DNA shared across 8 segments."

If your match is not a third cousin or closer, see Autosomal Triangulation.

One-to-One GEDmatch Confirmation

If you know the relationship to be third cousins or closer through traditional genealogy and GEDmatch's One-to-One utility predicts that your match could be a third cousin or closer, see the DNA Confirmation Example for a walk-through of which relationships can be confirmed and how to mark them.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA using GEDmatch:

* Maternal relationship is confirmed by a 1417.42 cM match between [[Roberts-7085|Peter Roberts]] GEDmatch T412 069 and his maternal uncle [[Dekle-6|Dekle-6]] GEDmatch T559569.

If your match is not a third cousin or closer, see Autosomal Triangulation.

Autosomal Triangulation

Do not mark any relationships on WikiTree as Confirmed with DNA based on just one test match unless it's with a third cousin or closer (see above).

You will need at least three test matches (you and two more who are more distantly related to each other beyond third cousins) who all match on the same segment of DNA to confidently confirm which ancestor(s) you have in common.

If all the test-takers are on 23andMe click on TOOLS, then click on DNA COMPARISON. Use the Compare tool to view the segments shared by all the cousins. Note the chromosome number where the segment is located and the segment's size in centimorgans (cM). It should be 7cM or more.

Family Finder does not allow you to see exactly how your matches match each other on specific segments. "In Common With" is insufficient. Consider uploading your results to GEDmatch.com to enable chromosome segment comparisons to be made using their Triangulation utility.

AncestryDNA does not allow you to see exactly which segments of DNA are shared by your cousins. "DNA Circles" are insufficient. Consider uploading your results to GEDmatch.com to enable chromosome segment comparisons to be made.

If all the test-takers are on MyHeritage click on DNA Matches. Choose a match and click Review DNA Match. Scroll down through your shared matches with that person and find matches that have a small chromosome browser icon to the right hand of the match's information. Click on this, which will take you to the One to Many Chromosome Browser and Triangulation tool. You can click the "Add or Remove DNA Matches" button to add more matches to the browser for comparison. Note the chromosome number where the segment is located and the segment's size in centimorgans (cM). It should be 7cM or more.

If all the test-takers have uploaded to GEDmatch, use their Triangulation utility, One-to-Many utility (for you and each segment sharing cousin) and/or the One-to-One Compare for each of the test takers in the triangulated group (TG). Find segments measuring 7cM or more that you share (i.e. overlap) with two or more people who are all distant cousins to each other. The 3D Browser is also useful.

Those who all match each other on the same segment form a triangulated group (TG). Using WikiTree's Relationship Finder, find the shared ancestral couple for that TG. The parent/child relationships in an ancestral line from each tester in the TG back to (but not including) the shared ancestral couple should be marked as "Confirmed with DNA".

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA, using triangulation:

* Paternal relationship is confirmed by a triangulated group consisting of [[Roberts-7085|Peter Roberts]] GEDmatch T412069, [[Sjostrom-39|Kris Sjostrom]] GEDmatch A936004 and [[Collins-5366| Elizabeth Collins]] GEDmatch T688604 sharing a 10.8 cM segment on chromosome 1 from 163621974 to 173712569.

X-Chromosome Confirmation

If the matches are both men there is a special opportunity for one-to-one confirmation if they match on their X chromosomes. Since men have only one X chromosome, no triangulation is necessary.

Here is an example of what to put in the Sources section of the profile when you mark a person's father or mother as Confirmed with DNA using xDNA:

* Maternal relationship is confirmed by a 108.0 cM X chromosome match between [[Kingman-271|John Kingman]] GEDmatch T782948 and his [https://www.wikitree.com/index.php?title=Special:Relationship&action=calculate&person1_name=Kingman-271&person2_name=Miller-45152 second cousin once removed Kelly Miller] GEDmatch A721343. Their MCRA is [[Babst-17|Charles Cyrus Babst]].

Y-Chromosome Confirmation

In order to easily compare DNA results of testers it is best for yDNA results to be in YSearch.org. The YSearch ID should be added to the test information on the tester's DNA Tests page.

If two males share the same or similar surname and match on about 90% of their Y-STR markers (or closer) then they likely share a direct paternal line ancestor in a genealogical time frame. The closer the match, and the greater the number of markers being compared, the greater the certainty.

Closely related paternal line relatives (father/son, uncle/nephew, grandfather/grandson) will usually match exactly. Occasionally however a father and his son will differ on a marker thus making the father a closer match with a cousin than with his son.

This method can be used to confirm the father of both test-takers and the father of every direct-line paternal ancestor between the test-takers and their most-recent common ancestor (MRCA). It cannot confirm the father of the MRCA.

Here is an example of what to put in the Sources section of the profile when you mark a man's father as Confirmed with DNA using yDNA:

* Paternal relationship is confirmed through Y-chromosome DNA testing. [[Roberts-7266|Anonymous Roberts]] and [[Roberts-7085|Peter J. Roberts]] match on 36 out of 37 markers (see YSearch IDs 9WCMS and 97ZDB) thereby confirming their direct paternal lines back to their MRCA [[Roberts-7104|Thomas W. Roberts]].

Mitochondrial DNA Confirmation

In order to easily compare DNA results of testers, it is best for mtDNA results in MitoSearch.org. The MitoSearch IDs should be added to the test information on the DNA Tests page.

If two persons are an exact mtDNA match on HVR1 and HVR2 (not counting minor mismatches) then their direct maternal lines back to their most recent direct maternal line ancestor is confirmed.

Here is an example of what to put in the Sources section of the profile when you mark a person's mother as Confirmed with DNA using mtDNA:

* Maternal relationship is confirmed by an exact HVR1 and HVR2 match between [https://www.wikitree.com/index.php?title=Special:DNATests&u=6727476&id=7 this Family Tree DNA mtDNA test] for [[Weatherford-199|Priscilla Weatherford]] and [https://www.wikitree.com/index.php?title=Special:DNATests&u=7713929&id=7 this Family Tree DNA mtDNA test] of her maternal line cousin [[Zimmerman-1613|Clair Zimmerman]].

DNA Confirmation Example

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This page was last modified 21:46, 17 April 2018. This page has been accessed 35,220 times.