Hot answers tagged

20 votes
Accepted

Why are 99% of my Ashkenazi DNA matches not in the Middle East or Central Asia?

I think the answer is simply that these DNA testing companies are all American companies and have primarily targeted the American, European, and Australian markets. I suspect they have a comparatively ...
  • 18.6k
13 votes
Accepted

Generational Loss of Data with DNA Testing

(Note: I did not view the updated part of the question before writing this answer, so my original answer does not address the specific scenario added in the update. See the section below the dividing ...
  • 24.5k
13 votes
Accepted

Asking distant cousins for DNA?

I battled with how to approach this when I first set out on my DNA testing 'saga' about two years ago and have learned a few things over now 60 plus completed kits that I manage across multiple family ...
  • 5,531
12 votes

Asking distant cousins for DNA?

Unless you find a living cousin who shares your interest in family history, and in DNA tracing, your efforts may be wasted. Those who have no particular interest in family history are unlikely to ...
  • 2,569
10 votes

Understanding Ancestry DNA results for second cousins?

You're definitely on the right track in terms of possible relationships (cross referencing the cM counts you gave with the ones http://thegeneticgenealogist.com/wp-content/uploads/2016/06/Shared-cM-...
10 votes

Why no DNA match with possible seventh cousin?

The amount of autosomal DNA shared by 6th or 7th cousins is quite small. Some will share no detectable DNA. The latest data of the Shared cM Project shows that seventh cousins share between 0 and 57 ...
  • 18.6k
10 votes
Accepted

How to narrow down the best DNA donors in a large family?

I think you just posted that question to make all other genealogists envious of what you have to work with. :-) But seriously, yes, there are some things you should do and do as soon as possible (i.e....
  • 16.5k
10 votes
Accepted

Explaining major discrepancy in genomic position between Gedmatch and MyHeritage?

It looks like this may be due to a difference in the Genome Builds (https://en.wikipedia.org/wiki/Reference_genome#Human_reference_genome) used between the two tools. GEDMatch reports that they ...
10 votes

Sharing 52% DNA with mother

This could also be explained if the parents share DNA. If you took the same test with your father and it also was > 50%, it could indicate they are distantly related. A single shared chromosome ...
  • 201
9 votes

Finding haplogroup through raw DNA data?

I obtained my Y-DNA haplogroup from my AncestryDNA raw DNA file using the first method detailed in this link: https://www.geneticgenealogist.net/2016/01/how-to-get-ydna-haplogroup-from.html In short,...
9 votes
Accepted

How to get an elderly person to provide saliva sample for DNA?

I had my 93 year old uncle take a test after he agreed to do it. I did not feel comfortable asking him to do it, or for me to attempt to administer it. My uncle was at a nursing home. I asked one ...
  • 16.5k
9 votes
Accepted

Any issues getting FTDNA sample vials through airport customs?

I didn't want to say anything until I was back home, but bringing everything in my carry on bag in both directions, worked. So, I'm now home successfully with 8 vials of DNA sample obtained from ...
9 votes

How many generations back will specific ethnicity show up in DNA?

It depends somewhat on the ethnicity and how distinguishable it is from the predominant ethnicity. For example, it seems that trace amounts of DNA from Native American ancestors is more difficult to ...
9 votes

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

I think the prior answers are either misleading or wrong, and people should not miss out on the opportunity to get great DNA information because they were discouraged by those answers. If you have ...
8 votes
Accepted

How long do results typically take for AncestryDNA test?

Each entities lab's time are different and it also depends on what test you perform. This is due to them queuing up tests into large scale batches to use shared labs since many do not have their own ...
  • 5,531
8 votes
Accepted

Is it common to have no close yDNA matches on Family Tree DNA?

Yes it is very common to only have few or no matches at higher levels. I recently have been advising someone who got screaming mad (literally) about spending so much money and having no matches.. so ...
  • 5,531
8 votes

Is this adopted DNA match my niece or half sibling?

The adoptee is very likely your niece, specifically the half-sibling of the niece you have also tested. The relationship could be diagrammed as follows: The X-DNA is key to determining this ...
  • 18.6k
8 votes
Accepted

How far back is a mtDNA match of genetic distance 2 likely to be?

Mitochondrial DNA mutates very slowly. Like on the order of one mutation in a thousand or so years. FamilyTreeDNA have published a guide on Understanding Your mtDNA Full Sequence Results. For the ...
  • 18.6k
8 votes
Accepted

Reconstructing autosomal genomes of Mayflower passengers

As of 2010, there were about 28,000 documented dues-paying Mayflower descendants. There have probably been about 16 million DNA tests taken by people in the United States, or about 1 out of every 20 ...
  • 16.5k
8 votes

Can Ancestry.com DNA matches be wrong

Errors of this magnitude are possible but very very rare. I'm sorry I don't have the documentation but there was discussion on at least one of the lists/groups for genetic genealogy about a case ...
  • 2,436
8 votes

Can the amount of saliva affect how many centiMorgans are shared between 1st cousins?

Absolutely not. The amount of saliva is a factor in whether or not you get DNA results at all. If you have them, that's it. While there is such a thing as "partial results" it's because you need ...
  • 2,436
8 votes

How accurate is Ancestor Timeline of 23andMe?

It's statistics. "Accurate" simply doesn't apply: a prediction may be 99% likely, but that will not mean a thing to that 1 in 100 where it fails -- and you have no way of knowing which group you fall ...
  • 999
7 votes

Interpreting X DNA?

One of my favorite math teachers in high school told us that whenever we got stumped, we should draw a picture to get a better definition of what the problem was. Here's a recent (12 June 2015) ...
  • 24.5k
7 votes
Accepted

Genetic Distance to Generations Calculation for Y-STR DNA tests

First, it is important to note that all the probabilities provided in these charts are estimations. Different formulas have been proposed and used to give us an idea of what a relationship might be ...
  • 18.6k
7 votes

How to interpret a reasonable X DNA Match, but no shared cM Autosomal result on GEDMatch?

For a person who is related somewhat distantly (say, third cousin or farther), it is common to share only a single DNA segment (if any). The shared segment may be located on an autosome or, if the ...
  • 3,857
7 votes
Accepted

My Father passed away - next test(s) on what remains of his DNA sample?

The short answer is being you have completed a very basic Y test and you should have met ftDNA's internal requirements of first doing a Y-## test before being able to order a BigY test and even if ...
  • 5,531
7 votes

Is a half-sibling match on AncestryDNA reliable, or is more testing needed?

The result should be reliable in that it shows a close relationship. As shown on the Autosomal DNA statistics page on the ISOGG Wiki, the relationship is almost certainly one of these: one of you is ...
  • 3,857
7 votes
Accepted

Y-DNA haplogroup R1a1ab2 Z93 Z94 in England?

The service you used, Living DNA, seems to try on its web site to avoid telling much about what kind of testing it is doing, especially avoiding standard terms. Digging though its help system, it ...
  • 3,857
7 votes

What is the meaning of Shared Segments in the DNA

"8 shared segments" means there are 8 separate sequences of over a "significance" threshold (this is often 7 centimorgans or cM) within which you match the other individual. To be included in one of ...
7 votes

Why are 99% of my Ashkenazi DNA matches not in the Middle East or Central Asia?

You could try MyHeritage DNA. They are the DNA Branch of MyHeritage based in Israel, and they have a larger portion of European and Middle East customers than the other DNA testing companies. They ...
  • 16.5k

Only top scored, non community-wiki answers of a minimum length are eligible