Go Back   Family Tree DNA Forums > Universal Lineage Testing (Autosomal DNA) > Family Finder Advanced Topics

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

Reply
 
Thread Tools Display Modes
  #1  
Old 12th September 2017, 06:31 AM
infososo infososo is offline
FTDNA Customer
 
Join Date: Aug 2017
Posts: 3
Understanding Jewish versus Italian DNA

On Ancestry I show as 59% Ashkenazi Jewish, and on FTDNA I show as 65% Jewish (52% Ashkenazi, 13% Sephardic). On Jtest I show as 19.76% Ashkenazi (about 20% is usually someone who is around 3/4 Jewish) and on Mixed Mode Population Sharing all of them are between 62% and 75% Ashkenazi.

My dad is 100% Ashkenazi Jewish (shows as 100% on Ancestry and FTDNA and 34 on JTest).

But my mom has no known Jewish ancestry and is genealogically 50% English, 25% Italian and 25% Irish.

I got my mom tested and on Ancestry her results are:
Great Britain 26%
Italy/Greece 22%
Europe West 21%
Ireland 15%
Scandinavia 4%
Iberian Peninsula 4%
European Jewish 2%
Finland/Northwest Russia < 1%
Europe East < 1%
Caucasus 3%
Middle East 1%

On FTDNA she's 61% British Isles and 35% Southern European with no Jewish DNA. Her GEDMATCH Jtest result is 3.3%.

I know that many people who are 100% Italian can show a few percentage points Jewish, but my mother only has one Italian grandparent so it seems strange that so much DNA that the tests think is Jewish is passed to me.

From what I can gather, it appears that a lot of my mother's Italian DNA is being tagged by all of these tests as Jewish for me but Italian for her.

Can anyone help me understand?
Reply With Quote
  #2  
Old 12th September 2017, 11:51 AM
josh w. josh w. is offline
FTDNA Customer
 
Join Date: Mar 2005
Posts: 2,379
Quote:
Originally Posted by infososo View Post
On Ancestry I show as 59% Ashkenazi Jewish, and on FTDNA I show as 65% Jewish (52% Ashkenazi, 13% Sephardic). On Jtest I show as 19.76% Ashkenazi (about 20% is usually someone who is around 3/4 Jewish) and on Mixed Mode Population Sharing all of them are between 62% and 75% Ashkenazi.

My dad is 100% Ashkenazi Jewish (shows as 100% on Ancestry and FTDNA and 34 on JTest).

But my mom has no known Jewish ancestry and is genealogically 50% English, 25% Italian and 25% Irish.

I got my mom tested and on Ancestry her results are:
Great Britain 26%
Italy/Greece 22%
Europe West 21%
Ireland 15%
Scandinavia 4%
Iberian Peninsula 4%
European Jewish 2%
Finland/Northwest Russia < 1%
Europe East < 1%
Caucasus 3%
Middle East 1%

On FTDNA she's 61% British Isles and 35% Southern European with no Jewish DNA. Her GEDMATCH Jtest result is 3.3%.

I know that many people who are 100% Italian can show a few percentage points Jewish, but my mother only has one Italian grandparent so it seems strange that so much DNA that the tests think is Jewish is passed to me.

From what I can gather, it appears that a lot of my mother's Italian DNA is being tagged by all of these tests as Jewish for me but Italian for her.

Can anyone help me understand?
My guess is that you are probably correct--your mother has minimal Jewish lines. At this point MO 2 lacks some empirical support.
Reply With Quote
  #3  
Old 12th September 2017, 10:32 PM
infososo infososo is offline
FTDNA Customer
 
Join Date: Aug 2017
Posts: 3
Quote:
Originally Posted by josh w. View Post
My guess is that you are probably correct--your mother has minimal Jewish lines. At this point MO 2 lacks some empirical support.
What I don't understand is why I show as more than 50% Jewish on all of the tests. It seems like they are tagging DNA I got from her as Jewish when they are tagging it her as Italian.
Reply With Quote
  #4  
Old 13th September 2017, 01:52 AM
khazaria khazaria is offline
FTDNA Customer
 
Join Date: May 2014
Posts: 425
Quote:
Originally Posted by infososo View Post
What I don't understand is why I show as more than 50% Jewish on all of the tests. It seems like they are tagging DNA I got from her as Jewish when they are tagging it her as Italian.
Mostly because much European Jewish DNA is literally Italian DNA from 2,000-1,200 years ago, so the calculator rotates between considering it Italian or Sephardic.

Also because your mother could indeed have a small amount of genuine Jewish ancestry, especially if she has any roots in Sicily or Calabria or Rome.
Reply With Quote
  #5  
Old 13th September 2017, 03:12 AM
infososo infososo is offline
FTDNA Customer
 
Join Date: Aug 2017
Posts: 3
I'm not sure if I am explaining myself very well. I think I understand the connection/overlap between Italian and Jewish DNA, as in it is very typical for someone who is full Italian to have some DNA that is seen as Jewish DNA. What I don't understand is why the same company (Ancestry, for example) would look at the very same DNA that I inherited from my mother and call it Jewish in me and Italian in her.

Ie. why am I 59% Jewish on the same test that my mother is only 2% Jewish? It seems like the company would have the same algorithm applied and so that the DNA she passed to me should be classified the same way in both of us.

The only way it makes sense to me is if I am at the absolute bottom of the range that they supplied, ie. 55%-66% and my mother is at the top of the range they gave her, 0-6%.This is statistically unlikely and also doesn't explain why I got such a high count on the GEDMatch Jtest, where my results are more in line with someone who is 3/4 Jewish.
Reply With Quote
  #6  
Old 13th September 2017, 06:18 PM
josh w. josh w. is offline
FTDNA Customer
 
Join Date: Mar 2005
Posts: 2,379
Quote:
Originally Posted by infososo View Post
I'm not sure if I am explaining myself very well. I think I understand the connection/overlap between Italian and Jewish DNA, as in it is very typical for someone who is full Italian to have some DNA that is seen as Jewish DNA. What I don't understand is why the same company (Ancestry, for example) would look at the very same DNA that I inherited from my mother and call it Jewish in me and Italian in her.

Ie. why am I 59% Jewish on the same test that my mother is only 2% Jewish? It seems like the company would have the same algorithm applied and so that the DNA she passed to me should be classified the same way in both of us.

'You get a 59% Jewish pattern when it theoretically should be 50%. This is not a large difference. The tests should be taken with a grain of salt and are not as precise as the numbers suggest. Khazaria has indicated how your mother might have a bit of Jewish ancestry.

The only way it makes sense to me is if I am at the absolute bottom of the range that they supplied, ie. 55%-66% and my mother is at the top of the range they gave her, 0-6%.This is statistically unlikely and also doesn't explain why I got such a high count on the GEDMatch Jtest, where my results are more in line with someone who is 3/4 Jewish.

Last edited by josh w.; 13th September 2017 at 06:21 PM.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Italian mother with no Italian results, but have middle eastern BEN89B myOrigins Basics 5 27th August 2017 05:48 PM
New Project: Jewish and Italian myOrigins vinnie myOrigins Basics 13 5th July 2016 09:47 AM
Comparing Jewish and Southern Italian results vinnie myOrigins Basics 133 17th August 2014 06:34 PM
Italian with pop finder showing 97.6% Middle Eastern Jewish neko myOrigins Basics 7 16th May 2014 07:25 AM
Italian R1b1 - The Central Italian Refugium johnraciti The Genographic Project 34 7th April 2007 09:00 AM


All times are GMT -5. The time now is 09:45 AM.


Family Tree DNA - World Headquarters

1445 North Loop West, Suite 820
Houston, Texas 77008, USA

Phone: (713) 868-1438 | Fax: (832) 201-7147
Copyright 2001-2010 Genealogy by Genetics, Ltd.
Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.