How could my estimate change over time?

Your ethnicity estimate is based on the data we have and the methods we use to compare your results to that data. Because we're always collecting more data and our methods are constantly improving, your estimate may change over time.

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What might change?

Your percentages for a region could change. Some new regions could appear. Some old regions, especially low-percentage regions, could disappear. Or you might not see much change at all.

You could see new regions.

When AncestryDNA launched in 2012, we compared your DNA against 22 possible regions. We now have more than 380.

You could see old regions turn into new ones.

For example, instead of one Iberian Peninsula region, we now have separate regions for Spain, Portugal, and Basque. And our Asia East region has been replaced by China, Korea and Northern Asia, Japan, Southeast Asia—Dai (Tai), Southeast Asia—Vietnam, and Philippines.

You could see new percentages—higher or lower.

Not only have new data and new methods enabled AncestryDNA to identify new regions, they have also improved our ability to determine how likely it is you belong to a region. These improvements mean that your percentages for a region could go up or down.

You could see regions drop off your estimate.

Because what AncestryDNA knows about the relationships between regions and DNA has improved, some regions may disappear from your estimate. This may be particularly true of regions that included 0% in the possible range on your earlier estimate.

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How can my DNA change?

Don't worry, your DNA hasn't changed. What has changed is how much we know about DNA, the amount of data we have available, and the ways we can look at it for clues to your past. You're still you.

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How does AncestryDNA predict the regions in my DNA Story?

Your DNA Story includes regions based on two different scientific processes: the AncestryDNA reference panel and Genetic Communities™.

The AncestryDNA reference panel is made up of people whose family have long-standing, documented roots in a specific area. We compare your DNA to this reference panel to determine your possible ancestry from hundreds up to a thousand years ago. Regions with a solid circle icon are based on the reference panel.

Genetic Communities are groups of AncestryDNA members who are most likely connected because they share fairly recent ancestors who came from the same region or culture. These groups identify areas where your ancestors may have lived more recently. Regions with a dotted circle are based on Genetic Communities.

DNA analysis is cutting-edge science. Genetic Communities are an example of that. We didn't use data from them in earlier versions of ethnicity estimates because that data didn't exist yet! Genetic Communities were actually discovered by AncestryDNA scientists only after millions of people had taken the AncestryDNA test. As scientific methods continue to advance and we get more data, your estimate could change.

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Why are there regions in my ethnicity estimate that a family member doesn't have?

There are two likely reasons for this.

First, because DNA inheritance is random, your results won't match a family member's exactly. You can read more about that here.

Second, we recently updated our ethnicity estimating process and have added even more global regions. If you’re comparing older results to new ones, you might see some of these changes:

Previous Region New Regions
Scandinavia Norway, Sweden
Iberian Peninsula Spain, Portugal, Basque
Europe South Italy, Greece and the Balkans, Sardinia
Europe East Baltic States, Europe East and Russia
Caucasus Turkey and the Caucasus, Iran
Europe West Germanic Europe, France
Native American Native America—North, Central, South; Native America—Andean
Asia South Southern Asia, Western and Central India, Balochistan, Burusho
Asia East Japan, Korea and Northern China, China, Southeast Asia—Dai (Tai), Southeast Asia—Vietnam, Philippines

In addition, our Africa Southeastern Bantu has been combined with our Cameroon & Congo region to become Cameroon, Congo & Southern Bantu Peoples.

These new regions reflect new data and improved methods for DNA analysis that were not available until recently.

Why did some of my percentages change so drastically?

It’s one thing to see your results for a region change by a few percentage points, but if you’re reading this, you probably saw a change of 10-20% or even more. That can be a little unsettling. Here are a few of the reasons behind these big changes.

In this update, “closely related” ethnicities have been better resolved.

The DNA of people from closely related regions can be very similar, making it more challenging to tell them apart. Since we can now look at DNA in longer segments than we did in the past, we are better able to identify differences in DNA in closely related regions. For example, we’re now better at distinguishing between what used to be our Great Britain and Europe West regions. In our updated estimate, many people with ancestors from England will see their percentages for England, Wales & Northwestern Europe (which replaces Great Britain) go up. Or your new estimate may include new regions or percentages that have been assigned to another region.

An ethnicity you had has been split into smaller regions.

In this case you will have lost one ethnicity and gained others. For example, in the update Scandinavia was split into Norway and Sweden. People who had Scandinavia before will see it replaced with other regions, including Sweden and Norway.

You can view a list of the regions that were split into two or more smaller, more specific regions here.

Africa presents special challenges.

The African continent is the ancient birthplace of humanity, and humans there are the most genetically diverse on earth. This makes Africa a tricky place for ethnicity estimation because you need lots of DNA samples to account for all that diversity. We’re working to increase the number of African samples in our reference panel so we can take full advantage of our new methods of analysis and provide even better estimates for Africa.

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Why am I missing a region I'm pretty sure I should have?

Here are some reasons why a region you think you should have might be missing from your estimate:

It could be the genetic influence of neighboring regions.

Some regions are very similar to others. Welsh ancestry might show up in the Ireland and Scotland region, or it could be reflected in England, Wales & Northwestern Europe. (The same goes for Scottish ancestry, as a matter of fact.) Germany, France, and other European countries can look very similar because people from those countries have intermixed so much over time. We're making our first predictions for Germanic Europe and France, but we expect those predictions to improve as we get more data.

It could be that the estimate is on the edges of our predicted range.

You may not share enough DNA with the members of our reference panel for us to see this ethnicity in your DNA.

It could just be the way genetic inheritance works.

Each person gets 50% of their DNA from Mom and 50% from Dad. But that means 50% of each parent’s DNA also gets left behind. Also, what gets passed down and what gets left behind is completely random. So you may not have inherited enough of the genetic markers associated with a particular region—though that doesn't mean that region isn't part of your past.

It could be because ethnicity estimation is still a work in progress.

Estimating regions in your past using your DNA is based on data that is still being collected and cutting-edge science that is still evolving. You can expect changes and improvements as our scientists gather more data and develop new ways of analyzing your DNA.

It could be because regions do not follow modern political boundaries.

Changes in country boundaries and historical migration patterns often mean that regions do not always reflect modern countries. For example, people from Austria may have more Slavic in their report than Germany because of the Austro-Hungarian Empire. Similarly, people with roots in Northern Italy may have a surprising amount of France in their results because France was in control of Northern Italy for centuries.

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Why don’t my ethnicity results match what I know about my family tree?

This is a question that comes up sometimes when people are talking about their ethnicity estimate: But where’s my [insert your missing ethnicity region here]? Here are a couple of things to consider if your ethnicity results don’t seem to match what you know about your family tree.

You may not have inherited the DNA that we associate with an ethnicity region.

Parents pass half of their DNA down to their children, but which DNA gets passed down and which doesn’t is completely random. That’s why even siblings can have different ethnicity estimates. So even if you have a Swedish ancestor somewhere back in your family tree, whether or not you get “Swedish” DNA passed down to you is partly a matter of chance.

Your family tree includes lots of people your genetic tree doesn’t.

With each generation, your odds of inheriting DNA from any one individual in your family tree decrease. So, your family tree is actually full of people who might not show up in your DNA test results—but they’re still family. This is especially true the farther back you go in the tree!

Look next door.

We create part of your ethnicity estimate by comparing your DNA sample to DNA samples in a reference panel that divides the world into 43 overlapping regions. Those comparisons are based on statistical probabilities—there’s no single perfect representative of French or Korean or Middle Eastern DNA. Because these are probabilities, and because regions overlap, sometimes your DNA might be a closer match to a nearby region in our reference panel than the one where your direct ancestors lived.

Genes don’t follow modern political boundaries.

The map of Europe looked very different prior to World War I—and even more different 200 hundred years ago. So even though relatives may be from a given country, their genes may be more similar to people from neighboring regions. For example, the Frisians live in the Netherlands and northern Germany, but they have ties to the Anglo-Saxons in England. And it shouldn’t be a surprise if someone from northern Italy had DNA that looked like it came from France.

Grandma may have been less French than you realized.

We often think of our ancestors as having come from one place. However, just like many people today, maybe of our ancestors had mixed backgrounds. So, if a great-grandparent who was born and raised in France was actually only 50 percent French, they have much less “French” DNA to pass down.

Some places are complicated.

Some places, like Nigeria, are home to many different peoples and populations. Others, like parts of Europe, have had fairly porous borders, and people have intermarried with people from surrounding regions. Both situations can make identifying populations or telling one group apart from another difficult. That’s why ethnicity estimation is an ongoing challenge—a challenge AncestryDNA scientist are meeting by gathering more samples and spending more hours in the lab.

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What if you don't have data for a region my ancestors come from?

AncestryDNA ethnicity estimates are based on available data. So what happens when we don't have much data about a region? Here's a current example. We don't have enough data right now to support separate regions for Laos, Cambodia, or Thailand. Until we get more data, people from those countries will typically see a mix of China, Southeast Asia—Dai (Tai), and Southeast Asia—Vietnam in their results.

Two more things to keep in mind. First, some populations do not differ enough at a genetic level to emerge as separate groups. Second, countries change over time, and boundaries on a map today do not necessarily represent genetic boundaries, so there may be population groups or countries that never fall into a single region.

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How do the regions get their names?

Most regions are named after a modern-day country or region where people in our reference panel have family going back generations or that members of a Genetic Community likely share in their past. However, there are two important things to keep in mind.

First, these are modern names that don't always reflect the history of a people. For example, Great Britain has been home to lots of different peoples, including native Britons, Celts, and Nordic and Germanic invaders. We don't know exactly how much or how many of each of these groups might be reflected in our current DNA samples. Another example is Iran, which is home to many ethnic groups.

Second, don't be surprised to see regions extending beyond modern political boundaries for the same reasons mentioned above. Our Baltic States region reaches into neighboring Poland, Belarus, Russia, and even Ukraine. And it should come as no shock to Brazilians to see our Portugal region among their results.

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How do I read the region maps?

A region map shows where we find the greatest concentrations of people assigned to a particular region. The maps are made using people born in the area, and where possible we use people with known deep roots in that area. The darker the color, the more people we find who have this region in their estimate. The maps are approximate, and people outside the highlighted shape may still have that region in their estimate. Similarly, not everyone living within the highlighted area will have the region in their ethnicity estimate.

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How does AncestryDNA predict the migrations in my DNA story?

Migrations are based on Genetic Communities™. Genetic Communities are groups of AncestryDNA members who are most likely connected because they share fairly recent ancestors who came from the same region or culture.

Once we identify a Genetic Community, we look for patterns in ethnicity and data from family trees linked to AncestryDNA, including ancestral birth locations, to see where their ancestors lived and moved to.

Historical researchers use that time and place data to look for the overarching story that binds the members of a Genetic Community together. While migrations may not tell your ancestor's story exactly, your DNA suggests that you are connected to this historical journey.

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Why don't I have any migrations?

Since migrations are based on Genetic Communities, if you don't have a strong genetic link to a Genetic Community, or if we haven't identified one that links to a migration in your ancestor's past, it won't appear among your results.

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Still curious to understand more? Cool--we're glad you're as interested in genetics as we are. Check out our white paper on ethnicity prediction.