The Big Y-700 Test Marries Science to Genealogy

Recently, one of my long-time friends and project co-administrators asked me a simple question.

• What do the FamilyTreeDNA Big Y-700 test and the Time Tree tell us when we have genealogy trees provided by testers?
• What does the Discover Time Tree tell us that’s different, and how do we reconcile the Time Tree and genealogy?

Those are great questions.

Sometimes, I get so buried in the details of genetic genealogy that I neglect the obvious, so I’m writing this article for my co-admin and anyone else with the same questions.

Time Tree Versus Genealogy Question

Of course, as a genealogist, my first answer would be that we always need to be cautious about user-provided trees. Even when the genealogy is accurate, that’s no guarantee there wasn’t a biological disruption that caused the genetic line not to be the same as the surname line.

Almost every lineage has examples of people whose genealogy was “off” or misattributed paternity occurred someplace upstream, meaning that someone carries the surname but does not descend from that biological lineage.

However, relative to DNA projects, the Big Y-700 tests provide one very important feature that STR testing does not and cannot do.

The Big Y-700 test creates a genetic tree, in conjunction with other testers, which provides scientifically calculated dates when branches of the genetic tree were formed.

The genetic tree should align, at least closely, with testers’ genealogical trees.

In other words, if their genealogy is accurate, testers “should” fit in (or at least near) the appropriate places on the branches of the genetic tree.

Furthermore, for people trying to sort out their actual branch in the tree, the Big Y-700 test is MUCH MORE reliable than the earlier STR (short tandem repeat) tests that are prone to random and back mutations. At one time, STR tests were all that was available, but now,  SNPs have been added to our arsenal. SNPs (single nucleotide polymorphisms) are extremely stable and reliable mutations.

I’m getting ready to record a new Y-DNA webinar, and I’m giving you a sneak peek of a couple of my slides here. I’ll publish an announcement when the webinar is available.

STRs Versus SNPs

Historic Y-DNA testing tested only a limited number of STR locations. That test reported the number of repeats at a specific genetic location on the Y chromosome. Today, the 37, 67, and 111 marker STR tests are still available to purchase.

What are the major differences between the two types of tests, and why would someone purchase one over the other?

If you purchase one of the STR tests, you purchase testing at a specific number of locations, such as 37, 67, and 111. The Big Y-700 test includes at least 700 STR locations, but the specificity of the Big Y-700 SNP testing replaces most of the STR test results in terms of lineage definition.

SNP mutations, when discovered in more than one man in a particular haplogroup lineage, are then named as haplogroups. That mutation is then found in each directly descended male in that line.

Put simply, the STR tests are now entry-level. Once you see what the Big Y-700 provides, you’ll absolutely want to upgrade to that test. Most of the time, if I know I’m testing someone from the correct line, I just purchase the Big Y-700 out the gate. If I’m not sure I’m testing the correct lineage, I’ll purchase the STR test first to make sure they match the correct lineage before upgrading to the Big Y-700.

Discover

The Discover tool was introduced to provide additional information to Big Y testers and others seeking haplogroup information. STR results can only predict a relatively high-level haplogroup, usually a few thousand years ago, while the Big Y-700 provides testers with an extremely granular haplogroup – usually decades to a few hundred years ago. Often, living men that span 2 or 3 descendant generations (grandfather, father, sons) discover that they have their own haplogroup branch on the tree of mankind!

However, if no one else from your line has tested in hundreds of years, Discover can only work with available information.

Let’s take a quick look at the Estes Group Time Tree.

Estes Project Group Time Trees

Group projects have Group Time Trees. You can view the Estes surname project, here. You can find a project for any surname by either googling “<surname> DNA Project” or scrolling to the VERY bottom of the FamilyTreeDNA main page.

If you’re signed into FamilyTreeDNA, you can also find projects in the top banner.

Once you’re on the project page, you’ll see an option for DNA Results (assuming the administrators have not made the project entirely private.)

Click on the DNA Results link and select Y-DNA.

Next, you’ll see “Group Time Tree.”

Group Time Tree Display

What appears next depends on how the project administrators have grouped the project participants.

I’ve grouped the Estes project by genealogical line, with the exception of a couple of people who carry the Estes surname but have experienced an adoption or other unknown parental event in their Estes lineage.

In some cases, there are simply two same-name lineages that were never from the same biological line. Unfortunately, occasionally they settle in the same place, making the genealogy difficult. Even worse, until Y-DNA testing came along, there was often no way to know they were two different families.

This situation is actually where the Big Y-700 test shines.

The Group Time Tree shows the genetic tree scientifically constructed from the SNP results of the Big Y-test results of the testers, at left. At right you’ll see the surnames of the testers along with their Earliest Known Ancestor (EKA) if they have entered that information.

Initially, you don’t even realize you’re actually looking at two types of information merged together. This display allows testers to see the genetic branching tree structure, at left, which is reflective of their actual genealogy, at right.

You can see that the birth year of Sylvester Estes, entered by a tester with haplogroup R-BY482, is 1622. Please note, there’s a typo. Sylvester was born in 1522, NOT 1622. This is a perfect example of what I meant by tree information sometimes being inaccurate and it’s very important when trying to correlate the genetic tree and the user-provided genealogy.

We discovered that R-BY482 (red profile above, at left) is an Estes “signature” haplogroup for the Estes line originating in Deal, England, with three other haplogroups that formed in descendant generations. We know this because every descendant from this line has this mutation.

R-BY490 was formed between Sylvester’s son Robert Estes, born about 1555, and his son, born about 1600, also named Sylvester. We know this because all of the descendants of Sylvester (born circa 1600) carry this mutation, but Robert’s son, Robert, born in 1603, does not.

The genealogy portion of the Group Time Tree, above, doesn’t reveal that information because testers either don’t know their genealogy that far back or perhaps listed an earlier known ancestor, such as Nicholas, born in 1495.

Click to enlarge

I created a spreadsheet tracking the Big Y-700 testers of the descendants of Nicholas Estes, along with their descendant haplogroups.

We know that Robert, born in 1555, carries R-BY490 because both of his sons, Abraham and Richard, inherited that mutation, seen with green arrows.

However, this calls into question the associated genealogy because if Robert, born in 1603, descended from Robert, born in 1555, he too would have the mutation R-BY490 since Robert’s other two sons do. Note that the user-provided birth year typo of 1622 which should be 1522 is a century off – enough to be within the genetic band haplogroup birth band – but impossible for the genealogy table.

There is one other possibility: kit 166011, the descendant of Robert born in 1603, could have taken the earlier Big Y-500 test and never upgraded to the more powerful Big Y-700. That’s too much detail for this article, but the discrepancy between the genetic tree and the genealogy tree alerts us that additional research is warranted. The genealogy submitted for tester 166011 confirms that, indeed, 1622 is a typo.

There are no other descendants of known sons of Nicholas or Sylvester born in 1522 to test, but perhaps another will surface one day.

You can see that the more testers in any particular line, the more granularity we can achieve.

The Genetic Tree

How close is the genetic tree to the genealogical tree that has been confirmed?

We know that Sylvester was born in 1522, and his father Nicholas in about 1496. The scientifically calculated creation date of R-BY482 is 1493, just 3 years before the birth of Nicholas. Based on this, there’s a good chance that this mutation occurred between Nicholas’s unknown father and him, or perhaps between Nicholas and Sylvester.

You can view the scientific details of any haplogroup in Discover.

Discover’s BY-482 scientific details page shows its creation date range.

Marriage

You can see that the scientifically created tree and the genealogy information are both important.

In fact, the combination of both allowed us to identify the correct branch of a Wilbur man who matches Estes men but doesn’t know where he fits in the tree.

His haplogroup placed him definitively on the more recent R-BY154784 branch, and his autosomal results then confirmed his specific path of descent because he matches descendants of three generations of Estes men’s wives, showing that his branch descends from Joseph Estes and his wife Ritty Lee, through son Chism, on down to our tester. In this case, autosomal DNA results provided a boost-assist to the genealogy, which helped identify the generation that the Y-DNA haplogroup R-BY154784 actually formed.

This also informs us that Joseph Estes, born in 1780, carried haplogroup R-BY154784 because both of his sons have it. If Joseph hadn’t had that mutation, then both of his sons couldn’t have inherited it.

Therefore, the mutation that formed haplogroup R-BY154784 had to occur between Moses, born in 1711, and John, born in 1732. We know that because Moses’s other son’s descendants do not have that haplogroup.

The more descendants of any ancestor that test, the more specific and accurate the descendant haplogroup formation dates will be.

The marriage of genetic trees and genealogy is powerful indeed.

More Information

For those seeking more information, 70 pages of my new book, The Complete Guide to FamilyTreeDNA – Y-DNA, Mitochondrial, Autosomal and X-DNA is devoted to Y-DNA results.

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