Thanks to the modern miracles that are science and the post office it’s possible to get
just about anything in the mail now, from uncooked meals to DNA tests to a wig for your dog.
说起戴假发的狗 我可以聊上一整天 但今天的视频
And while I could talk about dogs in wigs all day,
this episode is actually about those DNA kits.
Just how accurate are they, and how much stock should you put in the results?
Private companies have offered these DNA tests for over a decade, but recently they’ve gone mainstream.
We’ve an episode Amy and Trace tried them out.
方法相当简单 你只需要吐口唾液到试管里 然后把他送到一个陌生人手里
The concept is pretty simple, you just spit in a tube and send it off to a stranger, except
this time they actually want your spit for once.
The company’s lab extracts your DNA from the cells in your spit and compares it to
DNA in their database.
数月后 你将得到一份明细报告 关于你的血统
A couple of months later, you get a breakdown of information about your ancestry, how at
risk you may be for some disease, and a bunch of other stuff.
Such and such percentage from Africa and a high risk for maple syrup urine disease and
It sounds cut and dry but there are a ton of asterisks along the way.
First there’s the fact that only a small percentage of your DNA is getting tested.
You’ve got over 6 billion base pairs in your 46 chromosomes (go you) and they get
passed on randomly from your parents.
The results can vary a lot, even among siblings.
One test of fraternal twins found one twin’s DNA was nearly twice as British and Irish
as the other.
Obviously they have the same parents so they have the same family history, but the DNA
that was passed down to them and then tested was wildly different.
To complicate things further, there is no one definitive gene from anyone that pinpoints
where they’re from.
Instead there are sets of genetic markers that populations might share.
Not everyone in that group will get all those genes, and some people from other places may
have some of the same genes by coincidence.
So when you get your results back from these tests and you see that you’re 25% european,
it doesn’t mean one quarter of your ancestors were european.
It means a quarter of the genetic markers they were able to test seem to be prevalent
the most in Europe.
Plus, the DNA you send in is not getting compared to a massive representative sample — these
companies are using as few as 115 people from certain regions to define what the genetic
markers of people from that region are.
这可不是许多人 还要记住基因是变换无穷的 即使在兄弟姐妹之间
That’s not a ton of people, and remember how much genes can vary even between siblings.
So using these tests to trace where you come from is fuzzy at best.
But they do have another compelling use: identifying if you carry the genes for certain diseases.
Again, this topic isn’t as straightforward as you might think.
These tests can identify if you have genes associated with certain diseases, but they
can miss minor variations to the genes, leading you to think you’re not at risk for a disease,
when in fact, you are.
But even if you do test positive for one of these genes it doesn’t mean you will 100%
get that disease, it just means you are more likely to get it.
You are at risk, and you can pass that risk on to your children.
If you take a DNA test that shows you carry genes associated with parkinson’s disease,
your risk of getting it is higher, but other factors like age could have more of an impact
than just having this gene.
These results are nuanced, and it’s important to go over them with a doctor who can walk
you through what they really mean.
These tests can be empowering and help you learn about who you are and what your future
But they’re less like the gospel truth and more like a horoscope with more accurate results.
I wouldn’t plan your entire identity and future around one DNA test.
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Trace and Amy actually tried these DNA tests to show you just how they work.
To find out what percentage of Trace is sasquatch, check out the video here.
Did you get your DNA Tested?
What were your results, and how serious do you take them?
在评论区告诉我们吧 订阅就能观看更多 感谢观看SEEKER
Let us know in the comments, subscribe for more, and thanks for watching Seeker.