Help:DNA Confirmation

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?

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→ 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, 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 autosomal match predicted to be a third cousin or closer?

2.a.) Yes

If the match for your Family Tree DNA Family Finder, 23andMe, or AncestryDNA test is predicted to be a third cousin or closer skip to the next question.

2.b.) No

If the match is beyond a third cousin, click here: Autosomal Triangulation. Note that a third cousin once or twice removed is beyond a third cousin.

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 Family Tree DNA Family Finder is predicting that your match may be a third cousin or closer, click here: One-to-One Family Finder Confirmation.

3.b.) 23andMe

If 23andMe is predicting that your match may be a third cousin or closer, click here: One-to-One 23andMe Confirmation.

3.c.) AncestryDNA

If your match at AncestryDNA is in the "3RD COUSIN" group or closer, click here: One-to-One AncestryDNA Confirmation.

3.d.) GEDMatch

If GEDMatch is predicting your match to be a third cousin or closer, click here: One-to-One GEDmatch Confirmation.



Instructions

One-to-One Family Finder Confirmation

If the predicted relationship range in "Family Finder - Matches" says your match could be a third cousin or closer and you know the person to be a third cousin or closer through traditional genealogy, 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:

* 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 the predicted relationship range in FAMILY & FRIENDS > DNA RELATIVES says your match could be a third cousin or closer and you know the person to be a third cousin or closer through traditional genealogy, 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:

* 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 a match at AncestryDNA is in the "3RD COUSIN" group or closer and this prediction corresponds with what you know from traditional genealogy, 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:

* 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 GEDmatch Confirmation

If GEDmatch's One-to-One utility predicts that your match could be a third cousin or closer and you know the person to be a third cousin or closer through traditional genealogy, 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:

* Maternal relationship is confirmed by a 1417.42 cM match between [[Roberts-7085|Peter Roberts]] GEDmatch F008867 and his maternal uncle [[Dekle-6|Dekle-6]] GEDmatch F15373.

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 or more distant 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 ANCESTRY TOOLS, then click on FAMILY INHERITANCE ADVANCED. Use the Compare tool to view the segments shared by all the cousins. Note the chromosome number 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 have uploaded to GEDmatch, use their Triangulation utility or One-to-Many utility (for you and each segment sharing cousin). Find segments measuring 7 cM or more that you share (i.e. overlap) with two or more people who are all distant cousins to each other.

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:

* Paternal relationship is confirmed by a triangulated group consisting of [[Roberts-7085|Peter Roberts]] GEDmatch F008867, [[Sjostrom-39|Kris Sjostrom]] GEDmatch A936004 and [[Collins-5366| Elizabeth Collins]] GEDmatch FE16264 sharing a 10.8 cM segment on chromosome 1 from 163621974 to 173712569.

X-Chromosome Confirmation

If you and your match are both men there is a special opportunity for one-to-one confirmation if you match either on your 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 18.89 cM X-DNA Family Finder match from 142421555 to 150560582 between [[Dekle-6|Dekle-6]] and his [http://www.wikitree.com/index.php?title=Special:Relationship&action=calculate&person1_name=Price-7294&person2_name=Dekle-6 fourth cousin twice removed] [[Price-7294|James Price, Jr.]]

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 [http://www.wikitree.com/index.php?title=Special:DNATests&u=6727476&id=7 this Family Tree DNA mtDNA test] for [[Weatherford-199|Priscilla Weatherford]] and [http://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



This page was last modified 15:07, 23 May 2017. This page has been accessed 340 times.