Your genetic family tree is not the same as your genealogical pedigree–and not just because of non-paternity events and adoption. Here’s how.
Your genealogical pedigree, if you are diligent or lucky (or both!) can contain hundreds, even thousands of names and can go back countless generations. You can include as many collateral lines as you want. You can add several sources to your findings, and these days you can even add media, including pictures and copies of the actual documents. Every time someone gets married or welcomes a new baby, you can add that to your chart. In short, there is no end to the amount of information that can make up your pedigree chart.
Not so for your genetic pedigree.
Your genetic pedigree contains only those ancestors for whom you have received some of their DNA. You do not have DNA from all of your ancestors.
You do not have DNA from all of your ancestors.
Using some fancy math we can calculate that the average generation in which you start to see that you have inherited zero blocks of DNA from an ancestor is about seven. But of course, most of us aren’t trying to figure out how much of our DNA we received from great great great grandma Sarah. Most of us just have a list of DNA matches and we are trying to figure out if we are all related to 3X great grandma Sarah. So how does that work?
Well, the first thing we need to recognize is that living descendants of Sarah’s would generally be our fourth cousins. Again, bring in the fancy math and we can learn that living, documented fourth cousins who have this autosomal DNA test completed will only share DNA with each other 50% of the time.
Yes, only half.
Only half of the time your DNA will tell you what your paper trail might have already figured out: that you and cousin Jim are fourth cousins, related through sweet 3X great grandma Sarah.
But here’s where the numbers are in our favor. You have, on average, 940 fourth cousins. So if you are only sharing DNA with 470 of them, that’s not quite so bad, is it? And it only takes one or two of them to be tested and show up on your match list. Their presence there, and their documentation back to sweet Sarah, helps to verify the genealogy you have completed. It also allows you to gather others who might share this connection so you can learn even more about Sarah and her family. Plus, if you find Jim, then Jim will have 470 4th cousins as well, some of which will not be on your list, giving you access to even more of the 940.
This genetic family tree not matching up exactly with your traditional family tree also manifests itself in your ethnicity results, though there are other reasons for discrepancies there as well. Read this article to learn more about why ethnicity results may not match.
In short, this DNA stuff is not a stand alone tool, but if you combine it with your traditional resources, it can be a very powerful tool for verifying and extending your family history. Remember, just because a cousin doesn’t show a match in DNA, it doesn’t mean there isn’t a genealogical connection! Genealogical research and primary sources can still prove connections even if DNA doesn’t show it.
Ready to learn more?
My goals as Your DNA Guide here at Genealogy Gems is to help you get the most from your DNA testing efforts, and to make it fun and easy-to-understand along the way. I’ve got more DNA articles for you. Check these out:
Listen to Lisa Louise Cooke’s interview with Ancestry’s Chief Scientific Officer, Catherine Ball, on how your DNA and pedigree chart can work together to reveal your family’s migration story:
In this episode, we’re focusing on early Virginia genealogy.
In our first segment, I’ve invited a professional genealogist to join us to help pave the way for tracing our ancestors back to Virginia just prior to the Revolutionary War. Jeri Satterwhite-Dearing specializes in early Virginia research in her work as a professional genealogist with Legacy Tree Genealogists. In this podcast episode she explains some of the biggest challenges you’ll face when researching early Virginian ancestors, the records you should be looking for, and some of the best resources.
In the second segment, I’ll cover a list of the best websites for Virginia Genealogy.
Fort Wayne, Indiana is the home of the second largest free genealogy library in the country. Make your plans to visit today. Learn more at https://www.visitfortwayne.com
Formerly known as Virginia Heritage, this website is a “consolidated database of finding aids that provides information about the vast array of manuscripts and archival materials housed in Virginia and West Virginia.”
From the website: “Part of the online presence of the Library of Virginia, the state archives and reference library. The Library maintains vast and varied collections of print materials, manuscripts, archival records, newspapers, photographs and ephemera, maps and atlases, rare books, and fine art that tell the history of the commonwealth and its people.”
From the website: “The Virtual Jamestown Archive is a digital research, teaching and learning project that explores the legacies of the Jamestown settlement and “the Virginia experiment.” As a work in progress, Virtual Jamestown aims to shape the national dialogue on the occasion of the four hundred-year anniversary observance in 2007 of the founding of the Jamestown colony.”
The latest episode of the free Genealogy Gems podcast (Episode 178) has been released and it’s PACKED with gems you can use now to inspire your family history!
First, nationally-renowned genetic genealogist CeCe Moore joins me on the show to talk about using DNA for genealogy research, adoption, and the Finding Your Roots with Henry Louis Gates, Jr. TV show.
I love CeCe’s analogy of using different DNA test providers to “fish in different ponds.” She talks about using different types of genetic tests (autosomal, y-DNA or mDNA) to chase answers to specific genealogy research questions, and the importance of using test results together, not in isolation. Because autosomal DNA is coming onto so many people’s radar, I ask her to explain that in more depth–its uses and its limitations. CeCe shares her favorite tips for people who are getting started and gives us lots of great buy gout medication examples, including a helpful example for African-Americans who are trying to identify a genetic ancestor (who may also have had a slaveholder relationships with the family).
Also in this episode, we announce the newest featured title in the Genealogy Gems Book Club: The Lost Ancestor (The Forensic Genealogist)by British author Nathan Dylan Goodwin. Listen to the episode to hear what this mystery novel is about and why we chose it.
Finally, I share some fantastic new record sets that are online now and ready for you to explore, and a Genealogy Gems listener shares an important update on adoption records in Ohio.
Your genealogical pedigree, if you are diligent or lucky (or both!) can contain hundreds, even thousands of names and can go back countless generations. You can include as many collateral lines as you want. You can add several sources to your findings, and these days you can even add media, including pictures and copies of the actual documents. Every time someone gets married or welcomes a new baby, you can add that to your chart. In short, there is no end to the amount of information that can make up your pedigree chart.
But here’s where the numbers are in our favor. You have, on average, 940 fourth cousins. So if you are only sharing DNA with 470 of them, that’s not quite so bad, is it? And it only takes one or two of them to be tested and show up on your match list. Their presence there, and their documentation back to sweet Sarah, helps to verify the genealogy you have completed. It also allows you to gather others who might share this connection so you can learn even more about Sarah and her family. Plus, if you find Jim, then Jim will have 470 4th cousins as well, some of which will not be on your list, giving you access to even more of the 940.
My goals as Your DNA Guide here at Genealogy Gems is to help you get the most from your DNA testing efforts, and to make it fun and easy-to-understand along the way. I’ve got more DNA articles for you. Check these out:
First, nationally-renowned genetic genealogist CeCe Moore joins me on the show to talk about using DNA for genealogy research, adoption, and the Finding Your Roots with Henry Louis Gates, Jr. TV show.
