DNA Links

Links for 19 September 2020 Meeting

Join us as we discuss what we learned from Megan Lee’s presentation on August 15. We will take a closer look at the tools and techniques introduced in her “Finding Mona” case study.

The links below are complementary to our September meeting.


News and Links for 13 August 2020

Linked below you will find news, blogs, and posts from the past month.

Three Pieces about DNA and African-American Genealogy

These articles and blog posts were all published in late July 2020, and are focused on African-American DNA and genealogy.

More About Ancestry DNA Changes

See the July 2020 section, below, for the start of this saga. Bloggers and genetic genealogists continue to publish articles, tips, and tricks about AncestryDNA’s upcoming changes.

More About the Sale of Ancestry.com

The results remain to be seen, but you can read about the sale below.


News for July 2020

There has been a lot of news in the past few days relating to DNA and genetic genealogy. Linked below you will find news, blogs, and posts from the companies themselves.

MyHeritage Phishing Attempt

Users are reporting multiple phishing attempts, focused on MyHeritage users, which may have been a result of the earlier GedMatch data breach (see below). If true, kit holders from other companies may also see phishing attempts. Be wary, and maintain constant vigilance! [nod to Mad-Eye Moody]

GedMatch Data Breach

GedMatch users began reporting anomalous matches and altered kit security settings on 19 Jul 2020. GedMatch took the site down, restored it, then took it down again. Currently, the site is down, with the following banner: “The gedmatch site is down for maintenance. Currently no ETA for availability” [21 Jul 2020, 10 pm PDT].

Ancestry DNA Changes Matching Algorithm

When Ancestry announced that they were changing their algorithm and removing matches of 6 cM and 7 cM, it seemed like this was the big news for the month. I put it in my July email to the DNA SIG, and we spoke about it at the July DNA SIG Zoom meeting. Clearly, it has been overtaken by events (above); however, it is still of great concern to many genetic genealogists. Please take the time to read these blog posts and decide how you are going to handle your Ancestry account(s). No one quite knows the deadline, either, but it seems to be the “end of July” or the “beginning of August.”

News Channels

I recommend that you subscribe to or “follow” one or more of the blogs mentioned above, so as to get your DNA news in the most timely manner. If Facebook is more your style, here are some Facebook Groups which will also help to keep you up-to-date on the latest genetic genealogy news. All these groups are private, therefore you will have to place a request to join.

Links for 20 June 2020

These links complement June’s DNA SIG online Zoom meeting.

Links for 16 May 2020

These links complement May’s DNA SIG online Zoom meeting.

The genetic genealogy field is an emerging technology and a rapidly changing field. The very best way to keep current is through Internet articles and blog posts; traditionally published books simply cannot keep up. Even though this links list is long and daunting, I encourage you to start somewhere – anywhere! – and read as often and as widely as possible. New links are posted often, so please keep coming back. You are welcome here anytime, to select an article and curl up in your favorite armchair or window seat to read and absorb.

Please select from a topic below, or simply scroll down to browse.

Getting Started

Tutorials and Basics

Vendor Focus

Third Party Tools

Intermediate and Advanced Techniques

Success Stories

Additional Resources

Note that the links below are all links to external sites and therefore will open in a new tab or window.

Getting Started

Read This First

Judy Russell’s excellent blog post DNA Resolutions for 2016 does a great job of setting the correct expectations for DNA testing and how it can and cannot help with your genealogy. Please do read this first!

Just Beginning – Why DNA Test? and How to Choose a Vendor

If you are trying to choose a test, or a company, read these articles. Then, take a look at the Tutorials and Basics section, below.

The Unexpected Result

Anyone considering submitting a DNA sample for genealogy purposes should be prepared for the unexpected result. Please read and carefully consider these articles.

The story below is concerned with determining the proper heir to a hereditary title in the UK. Members of a family participated in a DNA test, but turned up unexpected results.

This news item tells of a very unusual unexpected result. The article describes three different cases of human chimerism – one male, two female.

Legal Issues and Privacy

A selection of resources regarding privacy and legal issues.

First, some references:

Next, a couple of posts on the very important Terms and Conditions:

Legal Issues and Privacy: Family Tree DNA, January 2019

The tail-end of January 2019 has brought some very big DNA news from Family Tree DNA. Those of you who have DNA tests for yourself or your family members at Family Tree DNA have a vested interest in this topic. If you have tested there, presumably you received the letter from Bennett Greenspan in your email. I strongly recommend that, in addition to reading Mr. Greenspan’s letter, that you read whatever you can find on this topic, and give some serious thought as to how you are going to handle your kits at Family Tree DNA. As always, each consumer must decide for his- or her-self what is best. I have provided some links below to get you started.

First, the article breaking ths story:

Next, the press release from Family Tree DNA in response:

Below are several blog posts on this topic from Judy Russell, The Legal Genealogist:

Leah Larkin, The DNA Geek also felt strongly enough about this to post on it:

Legal Issues and Privacy: the Golden State Killer and DNA, April 2018

Although still part of “Legal Issues and Privacy,” this topic warrants its own section. Below, please find some posts on how DNA was used to find the alleged Golden State Killer. This news supersedes several of the posts below, in the “Archive” section.

The big DNA news in April 2018 was the arrest of a man suspected to be the “Golden State Killer.” Several jurisdictions have since brought additional charges against this man. Law enforcement used a DNA database we are all familiar with – GEDmatch – to assist them in their search. I have gathered here several blog posts from our most familiar bloggers, discussing this development. Within the posts are more links for additional reading. I strongly encourage you to educate yourself on this topic, which has huge ramifications for the future of genetic genealogy.

Legal Issues and Privacy, the Archive

These links are to posts which were written prior to the news of the “Golden State Killer and DNA.” These essays should be re-evaluated in light of this news. Next, some blog postings on privacy; most, but not all, from The Legal Genealogist:


Tutorials and Basics

General Basics and Tutorials

Lessons for beginners and refreshers for all.

Tips, Tricks, Hacks, and Workarounds

Y-DNA Basics

The Y-DNA test results will reflect the testee’s paternal line, from son, to father, to grandfather, etc. Only males can test. The most recent common ancestor of a Y-DNA match may have lived thousands of years ago.

Mitochondrial DNA Basics

The Mitochondrial DNA (mt-DNA) test results will reflect the testee’s maternal line, from child, to mother, to grandmother, etc. Both males and females can test. The most recent common ancestor of a mt-DNA match may have lived thousands of years ago.

Autosomal DNA Basics

The Autosomal DNA (at-DNA) test results will reflect all the testee’s ancestral lines; anyone can test. The most recent common ancestor of an at-DNA match will have lived within the genealogically recent past – a few hundred years ago.

Adoption & DNA

These sites are specifically designed for adoptees seeking their roots. Many of the techniques are adaptable to those who are not adoptees themselves, but have an adoptee or a brick wall in their ancestry. (Who among us doesn’t have a brick wall?) Be sure to also see the Success Stories

section below; several of those success stories deal with adoptees and their searches.

  • DNAadoption.com – Created by Rob Warthen, DNAadoption.com provides techniques and references for the DNA/Adoption search. Works in conjunction with DNAGedcom.com (listed below under Third-Party Tools) which supplies the tools.
  • DNA Adoption, a discussion group – this Yahoo! Group is restricted, which simply means you must request to join with a brief discussion of your reasons for joining.
  • Adoption DNA Tools, a discussion group – this Yahoo! Group is also restricted, therefore your membership request must be approved.
  • https://www.facebook.com/groups/DNADetectives/ – The DNA Detectives, a Facebook Group for those seeking unknown parents. To participate in this group, you will need to join via your Facebook account.


Vendor Focus

This section was originally created to support our discussion sessions during April, May, and June 2015, when each month was focused on one vendor, and on autosomal DNA only. However, this section has been updated and kept current since then. Below you will find groups of links detailing how each vendor delivers autosomal DNA test results. Please be sure to also review the links above under “Just Beginning” – several offer reviews of each company. Links which are already included elsewhere on this page may not be repeated here.

Family Tree DNA

Family Tree DNA was the first company to offer direct-to-consumer DNA testing, in March 2000. They are also the only company to currently offer Y-DNA and Mitochondrial DNA testing, in addition to Autosomal DNA testing. “Family Finder” is the autosomal DNA test from Family Tree DNA. Because pricing changes over time, and sales are sometimes offered, please check their website for current pricing.

Below are several links detailing how Family Tree DNA delivers autosomal DNA test results (aka Family Finder). These links are listed in chronological order, which is also roughly from basics to more advanced. Be sure to see the recent developments (May 2016) detailed at the end of the list.

In May of 2016, Family Tree DNA announced two “behind the scenes” changes which will be of interest to genetic genealogists. Several bloggers posted about these announcements; only a few will be shown here, but they link to the rest, so you can read all the blog posts on this topic by following the links.

In February of 2017, Family Tree DNA announced that they would resume accepting transfers of results from AncestryDNA and from 23andMe. The transfer itself is free; there is a fee of $19 to unlock some features. Here are some posts from genetic genealogy bloggers about the transfers.


AncestryDNA began offering direct-to-consumer DNA testing in May 2012. They currently offer an autosomal DNA test. Because pricing changes over time, and sales are sometimes offered, please check their website for current pricing.

Unique to AncestryDNA is that an Ancestry subscription is required to access many, although not all, of the DNA features. See the link below for Ancestry’s description of what is available with and without a subscription. They do offer a special subscription just for DNA customers, called “Insights.” It is not advertised and users must call AncestryDNA to obtain this subscription, for $49/year.

AncestryDNA has reported a database of more than six million autosomal testers as of November 2017. They had earlier reported the following: five million as of August 2017; four million as of April 2017; and three million as of January 2017.

Below are several links detailing how AncestryDNA delivers DNA test results. AncestryDNA has rolled out several updates and features over recent years. In late 2014, new matching algorithms were deployed behind the scenes; in November 2014, DNA Circles were implemented; in April 2015, New Ancestor Discoveries were introduced; in August 2015, Shared Matches made their appearance; and in November 2015, the Amount of Shared DNA quietly appeared. In May 2016, new matching algorithms were again implemented, and they modified their autosomal DNA chip. Most recently, in March 2017, AncestryDNA introduced Genetic Communities. The links below are listed in rough chronological order, and grouped by topic.


23andMe began offering direct-to-consumer DNA testing in November 2007. They currently offer an autosomal DNA test. Because pricing changes over time, and sales are sometimes offered, please check their website for current pricing.

23andMe has reported a database of more than three million autosomal testers as of November 2017.

The 23andMe website has been in a state of transition since November 2015, and is still in transition as of this writing (January 2017). The collected material posted below is in chronological order. Although all the material is applicable, it is not all applicable to everyone. Some customers are on the “old experience,” while others are on the “new experience,” and the tools are different for each.

May 2015 – Below are several links detailing how 23andMe delivers DNA test results. At this time (May 2015), the 23andMe website has been largely unchanged since about mid-2013, so you won’t see a flurry of recent blog postings, but the ones that you do see are still relevant. The most recent change was October 2014, when 23andMe partnered with MyHeritage to host their customers’ family trees. These links are listed in chronological order, which is also roughly from basics to more advanced.

November 2015 – Big changes are coming to 23andMe! 23andMe announced in late October that they will be implementing a “new experience.” On November 12, they made some changes to the existing “experience” in preparation; however, the majority of the changes are still in the future. Existing users will be transitioned to the “new experience” in phases; precise dates have not been announced. It may be as soon as November and December for some; for others, sometime in 2016 is expected. Below are some blog posts and forum posts with such information as is currently available.

December 2015 – Big changes have arrived at 23andMe! As some users are transitioning to the “new experience,” it is becoming clear that the changes so far at 23andMe are drastic. So drastic that some prominent bloggers have decided to temporarily suspend their recommendation of 23andMe; see their posts below. Also, be aware that the price (for new kits) has doubled and is now $199 plus shipping. The $199 is a purchase price and there is no additional subscription price.

June 2016 – The price for a 23andMe DNA kit remains at $199. They have announced that additional users will be transitioning to the “new experience” soon, perhaps as soon as August 2016. (It is unknown how many users have already been transitioned; also unknown is the timeline for transitioning all remaining users.) 23andMe have also announced a new “in common with” feature that is only available to those on the “new experience.” Collected here are some blog posts detailing what is known so far, and discussing the updates of June 2016.

August 2016 – It appears that a large number of U.S. customers has been transitioned to the “new experience.” International customers remain on the “old experience.” (This still appears to be the case in January 2017.)

September 2016 – 23andMe annouces a new pricing structure, with a $99 “Ancestry Service” and a $199 “Health and Ancestry Service.” This applies to the U.S.; pricing outside the U.S. varies.

October 2016 – 23andMe announces that their “partnership with MyHeritage has come to an end.” Since 23andMe terminated their previous in-house trees in October 2014, when they announced the Partnership with My Heritage, this leaves their customers with no tree functionality at 23andMe.

  • Family Tree Update – published 11 Oct 2016 by 23andMe on the Old Experience Forums (users will need to be logged in to read this).

December 2016 – 23andMe announces Ancestry Composition chromosome segment information.

February & March 2017 – It appears that a many, but not all, international customers have been transitioned to the “new experience.”

Judy Russell explains details about the 23andMe Class Action settlement in the post below.

MyHeritage and Geni

MyHeritage began offering direct-to-consumer DNA testing in June 2016. They currently offer an autosomal DNA test. Because pricing changes over time, and sales are sometimes offered, please check their website for current pricing.

MyHeritageDNA updates in January 2018: It looks like the big news for this month are the updates to MyHeritage. See what some popular bloggers have to say about it all.

MyHeritage DNA has reported a database of 670,000 autosomal testers as of November 2017.

CeCe Moore has written a blog post presenting her position that MyHeritage DNA is the “fourth pond.” It is well worth a read, and contains several success stories specific to MyHeritage DNA. CeCe has also written a subsequent post about unexpected discrepanices at MyHeritage DNA. Please read both posts, including comments, before making a decision on MyHeritage DNA.

MyHeritage and Geni are also genealogy vendors in their own right. Although you can purchase DNA test from MyHeritage, you can also transfer results from other vendors to your account at MyHeritage. Or, you can incorporate your DNA results into your tree at MyHeritage or Geni. These two genealogy sites are related companies under the same corporate umbrella, but are largely managed independently of each other. In June 2016, both began to offer DNA capabilities along with their previous offerings.

Living DNA

Living DNA is a British-based company offering an admisture test based on the “People of the British Isles” study. They do not currently offer matching, although they state that they plan to do so in the future.

Third Party Tools

List of Third-Party Tools

When you want more analysis than is provided by the consumer websites, take a look at these software tools developed by fellow citizen scientists and genetic genealogists.

  • GEDmatch.com – This site has a variety of tools; some are free and some are fee-based. Please see the expanded links section below. GEDmatch.com was created by Curtis Rogers and John Olson; as of December 2019 GEDmatch.com is owned by Verogen, Inc.
  • DNAgedcom.com – This site has a variety of tools; some are free and some are fee-based. Please see the expanded links section below. DNAgedcom.com was created by Rob Warthen.
  • Double Match Triangulator – This site offers the Double Match Triangulator software for download and installation. “It combines two or more different people’s Chromosome Browser Results (CBR) files from FamilyTreeDNA to provide Double Match and Triangulation data that can be used to help determine genealogical relationships.” Developed by Louis Kessler. More about the Double Match Triangulator below:
  • YourDNA.family – Presenting “Next generation tools for DNA genealogy;” this site is currently in closed beta (January 2020). You can sign up to be notified of updates by email. Developed by Andreas West.
  • Utilities by David Pike – This site has a variety of tools, described as: “… utilities for processing unzipped autosomal files from Family Tree DNA and/or 23andMe” – developed by David Pike.
  • MorleyDNA.com Y-SNP Subclade Predictor – Developed by Chris Morley.
  • Genome Mate Pro – This site offers the Genome Mate Pro software for download and installation. “Genome Mate is a desktop tool used to organize in one place the data collected while researching DNA comparisons. Besides data storage it has many features to aid in identifying common ancestors.” Developed by Rebecca Walker.
  • mtDNA Haplogroup Analysis – a web-based mitochondrial analysis tool developed and maintained by James Lick. Use the tool to further refine your mitochondrial haplogroup assignment from 23andMe.
  • The Triangulator – released in October 2017, the functionality was turned off in November 2017 due to privacy concerns from FamilyTreeDNA. The link will remain for reference purposes, and in case the tools regains functionality. The Triangulator was developed by Goran Runfeldt.

Chrome Extensions

Defunct Chrome Extensions

  • AncestryDNA Helper, also referred to as the “Snavely Tool.”
  • 529andYou, by neanderling; devlopment halted about January 2020.


GEDmatch.com is a third-party tools website which hosts multiple tools; some are free and some are fee-based. The fee-based tools are referred to as “Tier 1” tools. Registration is required for all tools.


DNAgedcom.com is a third-party tools website, created by Rob Warthen, which hosts multiple tools; some are free and some are fee-based. Subscribers gain access to additional, fee-based tools. Registration is required for all tools.

  • DNAgedcom.com
  • Autosomal DNA Segment Analyzer (ADSA); created by VCGS member Don Worth, and hosted on DNAgedcom.com. The ADSA is a tool to assist with visualization of triangulated match groups, and works with Family Tree DNA results and also GEDmatch results. Read the ADSA Manual and the pertinent Quick Start Guide, and then try it out.
  • DNAGedcom Client – downloadable software that runs on your desktop, the DNAGedcomClient downloads your AncestryDNA and your 23andMe match data. You must be a subscriber to download the DNAGedcom Client.

Intermediate and Advanced Techniques


Everyone is interested in their admixture results; how accurate are they? How can a testee put them to work?

Admixture – Specialty Research

Some researchers are interested in investigating specific admixture groups. The blogs and posts below are intended to connect you with these researchers.

  • The African Autosomal DNA Inheritance Survey – published 28 May 2017 by Shannon Christmas on his Through the Trees blog; Shannon is collecting data on matches with four grandparents from the same African nation.
  • Join LivingDNA’s German DNA Research Project – published 1 May 2017 by Shannon Christmas on his Through the Trees blog; LivingDNA is collecting data on individuals with four grandparents from Germany, all born within 50 miles of each other.
  • Native Heritage Project Blog – a blog by Roberta Estes which focuses on Native American and First Nations topics.
  • Roots & Recombinant DNA – a blog by TL Dixon, with a focus on DNA and also looks at African American and Native American DNA topics.


You have corresponded with your top matches; now learn to target your Most Recent Common Ancestor.

Chromosome Mapping

Chromosome mapping is one more tool in your toolbox. It can assist you to visualize your chromosomes, your matches, and your common ancestors.

  • Ancestor Chromosome Mapper – a web-based mapping tool; “This program will make a pretty chromosome map from a CSV file which lists ancestral DNA segments from your known paternal or maternal ancestors.” Created by Kitty Cooper. Free although donations are accepted.
  • Overlapping Segment Mapper – a web-based mapping tool; “The segment mapper will make a picture of the segment overlaps from up to 40 people in the CSV file you provide which is a list of your DNA match names and their overlapping segment information.” Created by Kitty Cooper. Free although donations are accepted.
  • Chromosome Maps Showing Centromeres, Excess IBD Regions and HLA Region – provides a CSV download that works in conjunction with the mapping tool, above, to enhance your chromosome map. Published 9 Jun 2016 by Sue Griffith, the Genealogy Junkie.

Visual Phasing

Visual Phasing is a technique which allows the user to visualize the DNA segments of grandparents when starting with three or more siblings. It is also known as “mapping the crossover points.” Developers of this technique are Kathy Johnston, Randy Whited, and Blaine Bettinger. These posts are all from Blaine Bettinger, and he references the earlier work by the other authors. Please note that if you sign up for Blaine’s email newsletter, you can download a free PDF e-book, “Guide to Visual Phasing,” which publishes these five blog posts in a single location.

Below are two posts from Sue Griffith with some techniques which will assist you in your journey of mapping the crossover points.

Online One World Trees

An online pedigree, or tree, is a crucial tool for any genetic genealogist. It is important to have something to share with your matches, to assist you both in finding your most recent common ancestor. There are many approaches to this, and any genetic genealogist has a plethora of choices for online pedigree trees to share with matches. Below is a selection of articles dealing specifically with One World trees.

Y-DNA Advanced

This section builds on the Y-DNA Basics section, above. Additional references will be added as they are identified.

X-DNA Advanced

Despite what you might think, X-DNA is not the opposite of Y-DNA. (In fact, mitochondrial DNA has a very similar, but opposite, inheritance pattern to Y-DNA.) But X-DNA has a very unique inheritance pattern, and it stands alone. It is not a separate test – it is usually tested along with Autosomal DNA.


Success Stories

Looking for encouragement? Perhaps these success stories will help.

Unlike the stories above, the link below will take you to a blog with 74 entries (and counting!); in fact, it is more like a book with 74 chapters. But be forewarned: this tale is highly readable and will draw you in until you wonder where your day went!

Here is an interesting one – the discovery of the story of two babies, switched at birth, in 1913. We can read this story from two sides – one author is a daughter of one of the babies, the other author is a granddaughter of the other baby. The story was revived and recapped – and told remakably well – in 2017 by the Washington Post.


Additional Resources

Genetic Genealogy Websites & Bloggers

There are many excellent genealogy blogs; this list focuses on bloggers whose specialty is DNA & genealogy. The list is ordered roughly by frequency of posts.

  • The Legal Genealogist – Judy G. Russell posts every day on the law and genealogy, and Sundays are DNA Day. Be sure to check in every Sunday at a minimum!
  • DNAeXplained – Roberta Estes is the second most prolific poster in this list. Enjoy her near-daily postings on DNA, genealogy, family, and sometimes, quilts!
  • Kitty Cooper’s Blog – Kitty Munson Cooper posts several times each month on genetic genealogy topics (and sometimes on gardening). She is also the developer of two chromosome mapping tools which you can find on her site, and she maintains the DNA-NEWBIE FAQ on the DNA-NEWBIE Yahoo! Group.
  • DNA and Family Tree Research – Maurice Gleeson presents his thoughts here. Although he is located in the UK, he is a popular presenter at events like SCGS’s Jamboree. He has posted his presentations and slides on this site, so you can review them at your leisure. Which is a good thing, since he is a high-energy, high-octane presenter!
  • Segmentology – Jim Bartlett’s blog about triangulation and chromosome mapping.

DNA-Related Facebook Groups

Here is a small selection of DNA-related Facebook Groups. Choose the one(s) that speak to your specific interests. All these groups are private.

Reference Sources

Lookups, Downloads, and FAQs

Year-End Retrospectives

Some of the bloggers listed above provided year-end retrospectives, highlighting the most read or most commented blog posts of the year. These are definitely worth a read!

2019 Retrospectives

2018 Retrospectives

2017 Retrospective & 2018 Resolutions

2016 Retrospective & 2017 Resolutions

2015 Retrospective & 2016 Resolutions

2014 Retrospectives

Page last updated: 13 Sep 2020.