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Family Finder Advanced Topics Advanced discussion about Family Tree DNA's Family Finder Product.

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  #1  
Old 25th February 2011, 06:00 PM
Time Traveler Time Traveler is offline
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Join Date: Apr 2009
Location: Southern California
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Where to Find Family Finder Info for the Layperson

I thus far have 7 5th to distant cousins and am delighted. I was hoping for the more distant. That said, I do not understand what I am looking at. I read the forums everyday. Bits and pieces that I am unable to put together into a meaningful picture.

I have 4 matches on Chromosome 2 with one individual:

123,479,782 - 127,215,188 - 1.56 cm - 800 matching SNPs
187,164,366 - 190,194,489 - 2.26 cm - 500 matching SNPs
136,451,084 - 138,567,581 - 2.14 cm - 600 matching SNPs
200,004,289 - 202,407,446 - 1.25 cm - 600 matching SNPs

What is the significance of the 4 matches on Chromosome 2?

I have a match on Chromosome 16 with one individual:

45,007,538 - 53,764,074 - 12.25 cm - 2,099 SNPs

What is the significant of the larger numbers.

I have another match on Chromosome 6 of 7.76 cm - 8,500 SNPs.

What does this tell me?

Can someone direct me to a tutorial written in easy-to-understand language?

Thanks
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  #2  
Old 25th February 2011, 06:03 PM
efgen efgen is offline
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Family Tree DNA FAQ:

http://www.familytreedna.com/faq/

And have you seen the posts about my webinars? I just gave one on Family Finder yesterday.

Check out my website for upcoming webinars. The full March schedule will be online before the end of this weekend:

http://www.relativeroots.net/webinars/

Elise
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  #3  
Old 25th February 2011, 06:55 PM
Time Traveler Time Traveler is offline
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Thanks - Yes, I have read all that I can find on the FTDNA site. It cannot answer my specific questions. Thanks for the heads up on the webinars - should be most informative.

TT
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Old 26th February 2011, 01:40 AM
mkdexter mkdexter is offline
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Quote:
Originally Posted by Time Traveler View Post
I thus far have 7 5th to distant cousins and am delighted. I was hoping for the more distant. That said, I do not understand what I am looking at. I read the forums everyday. Bits and pieces that I am unable to put together into a meaningful picture.

I have 4 matches on Chromosome 2 with one individual:

123,479,782 - 127,215,188 - 1.56 cm - 800 matching SNPs
187,164,366 - 190,194,489 - 2.26 cm - 500 matching SNPs
136,451,084 - 138,567,581 - 2.14 cm - 600 matching SNPs
200,004,289 - 202,407,446 - 1.25 cm - 600 matching SNPs

What is the significance of the 4 matches on Chromosome 2?

I have a match on Chromosome 16 with one individual:

45,007,538 - 53,764,074 - 12.25 cm - 2,099 SNPs

What is the significant of the larger numbers.

I have another match on Chromosome 6 of 7.76 cm - 8,500 SNPs.

What does this tell me?

Can someone direct me to a tutorial written in easy-to-understand language?

Thanks
Family Finder will show you all of the major shared segments, their sizes and locations, etc., that you share with someone else. It is shown because they want you to see all of the segments you share and not just the largest ones alone.

The match is based on the longest segment/block cM match you have with someone else unless it is closer than a 3rd cousin - if closer it is based on the sum shared cM too. The match is not based on the small 1cM segments in other words, it just happens that you share those smaller segments too but the match prediction is based on the largest, not smallest segments.

That said, those small 1 and 2cM segments on your chromosome 2 are not significant, what is would be the largest segment you did not list. They are listed because they exist. Unless you are looking for very distant and population type research data they are not significant.

Also 12.25cM is a closer match than 7.76cM. I bet FF predicts the bigger number as closer too, like maybe a 4th cousin for the 12.25cm and a 5th to distant for the 7.76cm, or something close to that.

What these tell you are predictions of where you and your match have a common ancestor. For a 4th cousin match you probably have the same great great great grandparents in common. There is a whole list in the FAQ for the FF test section of what each prediction means and what kind of in common ancestors there are for each.

The idea is that FF is there to help find others who match you of whom you can begin to work together and try to find a common distant link, such as ancestors that are in common 4 to 8 generations back, sometimes closer and sometimes more distant than that.


.

Last edited by mkdexter; 26th February 2011 at 01:47 AM.
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  #5  
Old 26th February 2011, 10:41 AM
Time Traveler Time Traveler is offline
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Talking

Matt -

Thank you very much for the straight-forward explanation. It is what I was hoping to receive. FF predicted all 7 of my matches as 5th - Distant.

I have a confirmed common ancestor with one. We share common ancestors at the level of my 6th great-grandparents. I have surnames in common with the others. One (12.12cm) is very exciting as we found one common surname. It is a family that I've believed my 5th great-grandmother came from but have found no evidence.

I'm really pleased with the Family Finder test!

Again, thanks.
TT
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