By chance, Child 1 has no British, French/German or Scandinavian DNA while Child 2 does. Here is what the children’s DNA might look like: Now she has children with her Japanese husband. Maybe the “Northern European” ancestry is really 15% British, 5% Scandinavian and 3% German/French. Mom might have an ancestry breakdown like: 23% Northern European, 46% Eastern European, and 31% Southern European. And these can get passed down differently leading to different percentages.
Now even the first mom’s all red becomes a variety of different colors. Now imagine the newer tests that split European, Asian, Pacific Islander, African, Native American and so on into many subcategories. It might have ended up that each child got one green bead each but it doesn’t have to be that way. It all has to do with which DNA you happen to get from each parent. In an ancestry DNA test, Child 1 would have 0% African ancestry while Child 2 would have around 4%. Now imagine a second child happens to get this arrangement:Īs you can see, by chance the second child inherited both green beads from mom. A DNA test would say the child has 0% African DNA. Red is European ancestry, blue is Asian ancestry.Īs you can see, by chance this child didn’t happen to get any green beads. This is actually pretty common in the U.S. The difference here is that mom has a small bit of African ancestry in her family tree. First we will add in some green beads from sub-Saharan Africa. Let’s now imagine a couple of more complex situations. It is a different story if the parents are not so red and blue.
This is the result if the parents happen to have 100% of a single ancestry type. They each have 50% European ancestry and 50% Asian ancestry. In this case you can see that each child actually shares the same ancestry, even though they got some different DNA from each parent. Here is what this child’s sibling might look like: This child has 50% European ancestry and 50% Asian ancestry. When these two parents have a child, that child will get a random half of mom’s beads and random half of dad’s. Let’s say that the European-ancestry beads are red and the Asian-ancestry beads are blue. Her DNA happens to have 100% European ancestry and his DNA shows 100% Asian ancestry.
Imagine that a man from Japan marries a woman from Europe. Since we are interested in ancestry here, we will say that different colors mean different ancestries. One way to think about this is to imagine DNA as a bunch of colored beads. And even more significantly, what DNA they share. This has consequences in terms of how much DNA siblings share. (Unless of course they are identical twins). Not every child gets the same 50% of mom’s DNA and 50% of dad’s DNA. DNA is Like a Bunch of Colored BeadsĭNA isn’t passed down from generation to generation in a single block. So yes, it is definitely possible for two siblings to get pretty different ancestry results from a DNA test. Culturally they may each say they are “1/16th Cherokee” but at the DNA level, one may have no Cherokee DNA at all. After all, they both got half their DNA from mom and half from dad.īut because of how DNA is passed on, it is possible for two siblings to have some big differences in their ancestry at the DNA level. It seems like brothers and sisters should have the same ancestry background.
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