7
Dec

What Do the Percentages on My Ethnicity Estimate Really Mean?

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If you have just gotten your DNA results back, you might have noticed that your ethnicity estimate is reported in percentages.  Are you wondering what all of these percentages in your ethnicity estimate really mean?  Does having a lot of one particular DNA region mean that you have recent ancestry from there?  Does a low percentage mean a distant ancestor?  I’ll answer these questions in this post. 

Does having a high percentage of a particular region mean that my ancestry from that region is recent?

This is one of the most common misconceptions about ethnicity estimates.  If someone has a high percentage (like more than 50%) from a particular region, they might think that that means that their “100% ancestor” must be one of their parents.  This can often cause people to get very concerned about their family tree – have they discovered a secret? Most of the time, there is a simple enough explanation and it doesn’t mean that we have uncovered anything necessarily surprising about our ancestry.

(Plus, ethnicity estimates can never be used to determine paternity)

High percentage of an ethnicity region can mean recent ancestry

Sometimes, having a high percentage of an ethnicity does mean that the parent was from, or had extensive ancestry in, the region in question.  I think of one of my family members who has a parent from the Philippines.  He took a DNA test and showed 50% Filipino DNA.  Since we know that his parent was from there, it makes perfect sense.

How do you know if your ancestry from the region is very recent, like only one generation?  If half of your ancestry is from a DNA region where you don’t live, then you will be able to easily spot this on your DNA match list.   You will notice that you have many cousins (from 1st-4th) who were either born in a country within the DNA region, or have many, many ancestors from there in their family trees.

Depending on where your recent ancestry is from, you might have trouble finding enough DNA matches on some of the most common DNA testing sites.  You might want to learn about places to upload your DNA so you can get more DNA matches to get a better understanding of your recent ancestry.

High percentage of an ethnicity region can also mean distant ancestry

Other times, having a very high percentage of a particular ethnicity means that many, or even all, of your ancestors have roots in a particular place.  For example, my husband has 100% Native American on Ancestry DNA.  He was born in a Mexican village that has well-known and well-researched indigenous Native American roots.  He is 100% Native American because all of his ancestors were.  This is a kind of obvious example, since he was born there, and of course his parents must have been 100% Native American, as well.

This same DNA inheritance pattern can occur in people whose families haven’t lived in the DNA region for centuries.  For example, my grandmother has 95% England, Wales, and Northwestern Europe on her DNA results.  While this obviously means that both of her parents had about half of their DNA from this region, it doesn’t mean that one of her parents was from England (or any other country within the DNA region).

My grandmother’s most recent ancestors who were actually born within the DNA region in question are three out of 32 great-great grandparents.  This isn’t enough to explain the 95% England, Wales, and Northwestern Europe DNA that she inherited.   All of her other ancestors, going back a few hundred years, were born in North America.  Instead, the most obvious explanation is that a vast majority of all of her ancestors on both sides of her family also had a majority of their DNA from this same region.  Basically, she inherited this DNA from many, many ancestors on all recent lines of her family.

If you think about it, it’s really not surprising that people with a common background married and procreated – especially historically.  Marriage in the same community was a great way to ensure social support, which a long time ago also meant survival and prosperity.

If I have a small percentage of DNA from a region on my ethnicity estimate, does it mean that my ancestor is from a really long time ago?

DNA inheritance is a funny thing.  A child inherits 50% of their DNA from each of their parents, but they only inherit 50% of each of their parent’s DNA.  This very simple sentence is key to understanding your ethnicity estimate.  Basically, some of the parent’s DNA is left behind each generation, and we don’t know which DNA got passed down and which DNA got inherited (unless, of course, everyone has taken a DNA test).

What is the ethnicity estimate “rule of thumb”?

If someone only has 2% DNA from the Norway DNA region on Ancestry, some people might assume that the DNA trajectory looked something like this:

  • DNA tester: 2%
  • Parent of DNA tester: 4%
  • Grandparent: 8%
  • Great-grandparent: 16%
  • Great-great grandparent: 32%
  • Great-great-great grandparent: 64%
  • Great-great-great-great grandparent: The “100%” Norwegian ancestor

The above scenario could definitely be the way that our DNA tester’s Norwegian DNA was passed down.  It’s a good rule of thumb, especially when we don’t have any more information to work with and we are trying to estimate how far back our ancestor from a particular region came into our family line.

Small percentages of ethnicity region usually means distant ancestry

It’s also important to understand that there are many other scenarios that could apply to our DNA tester’s 2% Norway DNA.  For example, they could have inherited 1% from both of their parents, making our estimated distance to the Norwegian ancestor twice as far back as we originally estimated.  Alternatively, the DNA tester’s parent might have inherited the 2% Norway DNA completely intact from their parent (the tester’s grandparent), meaning the parent only had 2% Norway DNA, too.

A few more options for our 2% Norway DNA would be that the DNA tester’s parent had 15% Norway DNA and 85% Eastern Europe and Russia DNA, and when the randomly selected 50% of their DNA got passed down to their child, the child just happened to get more of the Eastern European and Russian DNA.

Occasionally, an ethnicity region is wrong

It’s important to mention that while DNA ethnicity estimates are very accurate, especially with Ancestry DNA, 23andMe, and Family Tree DNA, it’s possible that a particular region has been reported in error.

When this happens, it’s not the fault of the DNA testing company.  DNA is pretty tricky, and sometimes DNA from one region looks so similar to DNA from another region that it’s hard for the testing company’s algorithm to tell is apart. 

This is most likely to happen between two adjacent regions, just because DNA from neighboring regions will tend to have more similarities than two regions that are very far apart geographically.  

For example, Norwegian DNA could be confused with Swedish DNA, and Scottish DNA could be confused with English. 

Conclusion

I hope that this post gave you some ideas about understanding your ethnicity estimate and the percentages that you see.  If you have any questions about something that you have read in this post, or would like to share your ethnicity estimate and percentages, I would love to hear from you in the discussion below,

  Thanks for stopping by!

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What Do the Percentages on My Ethnicity Estimate Really Mean?
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What Do the Percentages on My Ethnicity Estimate Really Mean?
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Are you wondering what all of these percentages in your ethnicity estimate really mean? Does having a lot of one particular DNA region mean that you have recent ancestry from there? Does a low percentage mean a distant ancestor?
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Who Are You Made Of
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