What can DNA tests really tell us about our ancestry? - Prosanta Chakrabarty
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Date: 2020-08-22
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Comments and reviews: 10
Dale
So I get a DNA test. My daughter gets a DNA test. Her half- brother gets a DNA test. Apparently I am more genetically connected to my daughters half brother than to her! Huh? This article is wrong about recombination. You get your DNA most likely from unequal amounts in your parents. You may get 70% from your father and 30% from your mother. Think about it. If it was a 50-50 spilt everytime, it would be impossible for me to be more genetically matched to my daughters half brother than to her! I was confused about this so I did some research and it gets even more confusing. Theres old DNA and new DNA. I was reading a geneticists paper explaining DNA and he was very clear on this: You most likely don't have a 50-50 split of DNA from both parents. In fact, after your grandparents, I. E, great grandparents, you may not have ANY matching DNA to certain ancestors more than 3 generations past. Huh? I strongly recommend asking questions of geneticists.
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So I get a DNA test. My daughter gets a DNA test. Her half- brother gets a DNA test. Apparently I am more genetically connected to my daughters half brother than to her! Huh? This article is wrong about recombination. You get your DNA most likely from unequal amounts in your parents. You may get 70% from your father and 30% from your mother. Think about it. If it was a 50-50 spilt everytime, it would be impossible for me to be more genetically matched to my daughters half brother than to her! I was confused about this so I did some research and it gets even more confusing. Theres old DNA and new DNA. I was reading a geneticists paper explaining DNA and he was very clear on this: You most likely don't have a 50-50 split of DNA from both parents. In fact, after your grandparents, I. E, great grandparents, you may not have ANY matching DNA to certain ancestors more than 3 generations past. Huh? I strongly recommend asking questions of geneticists.
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B0bby
Hold on. The genetics from ancestors long ago is often present entirely, if at all, in our genome, and simultaneously, we test the genome's of modern people. Therefore, someone may have 10% French DNA in them, but these genes are only present because the chance of receiving them from long-ago ancestors was randomly higher than average, BUT because most people living in France might have lower amounts of those specific genes as that's the average distribution between ancestors. This means you might actually be 10% French, but the genes that make you French aren't present in such large quantity's in the modern French, making the test even less accurate.
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Hold on. The genetics from ancestors long ago is often present entirely, if at all, in our genome, and simultaneously, we test the genome's of modern people. Therefore, someone may have 10% French DNA in them, but these genes are only present because the chance of receiving them from long-ago ancestors was randomly higher than average, BUT because most people living in France might have lower amounts of those specific genes as that's the average distribution between ancestors. This means you might actually be 10% French, but the genes that make you French aren't present in such large quantity's in the modern French, making the test even less accurate.
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Toaster
This video is politically biased. The sister with the 10% french DNA IS in fact most likely more french than the other sister, don't deny that. But only genetically. It doesn't mean her culture is french.
For example, if you breed a dog that is 10% wolf, you will get a more wolf-like animal. But it will still be a great family dog, if you socialise it that way.
In plants and animals scientists classify these hybrids from F1 to F5, meaning that a F1 generation is 50% french, whilest 10% is likely a F3 or F4. We just don't use these scientific descriptions on humans because of political agendas.
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This video is politically biased. The sister with the 10% french DNA IS in fact most likely more french than the other sister, don't deny that. But only genetically. It doesn't mean her culture is french.
For example, if you breed a dog that is 10% wolf, you will get a more wolf-like animal. But it will still be a great family dog, if you socialise it that way.
In plants and animals scientists classify these hybrids from F1 to F5, meaning that a F1 generation is 50% french, whilest 10% is likely a F3 or F4. We just don't use these scientific descriptions on humans because of political agendas.
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Christer
I did a DNA test on MyHeritage and the results showed that I am probably:
96, 1% Scandinavian (Norwegian)
2, 3% Finnish
1, 6% Central Asian
All my family are norwegians, so I don't know anyone from Finland. But now I know the reason why I have brown eyes, which I assume must come from the 1, 6% Central Asian genes. No, I don't have monolid eyes, I have pretty much Scandinavian features. My hair is dark brown and I am a little red-bearded. Just a tiny bit more pigments in my skin than any other norse people, but still white. Also, I like sauna and ice bathing: D
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I did a DNA test on MyHeritage and the results showed that I am probably:
96, 1% Scandinavian (Norwegian)
2, 3% Finnish
1, 6% Central Asian
All my family are norwegians, so I don't know anyone from Finland. But now I know the reason why I have brown eyes, which I assume must come from the 1, 6% Central Asian genes. No, I don't have monolid eyes, I have pretty much Scandinavian features. My hair is dark brown and I am a little red-bearded. Just a tiny bit more pigments in my skin than any other norse people, but still white. Also, I like sauna and ice bathing: D
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hasani
What this video focuses on, is Ethnicity estimations. What they dont mention. is DNA matching, to actual relatives, you share one or more ancestors with, within the last 8 generations. In that regard, this video, gives a very incomplete picture, of the power of these test, to help you trace your Ancestry.
Signed, a Genetic Genealogist.
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What this video focuses on, is Ethnicity estimations. What they dont mention. is DNA matching, to actual relatives, you share one or more ancestors with, within the last 8 generations. In that regard, this video, gives a very incomplete picture, of the power of these test, to help you trace your Ancestry.
Signed, a Genetic Genealogist.
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ProphetofProsperity
Wow, I'm actually shocked they were allowed to post this. Spoiler alert, if you bought one of those ancestry tests, you were ripped off. The joke is on you, read the fine print. Stop thinking if it is a DNA test then it must be 'scientific' and 'true'. Step your understanding of the world UP!
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Wow, I'm actually shocked they were allowed to post this. Spoiler alert, if you bought one of those ancestry tests, you were ripped off. The joke is on you, read the fine print. Stop thinking if it is a DNA test then it must be 'scientific' and 'true'. Step your understanding of the world UP!
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Jacob
My question has always been, Does it matter?
Outside of health risks or benefits, it shouldn't. If your great great whatever used to be a badass, that doesn't mean you get to be proud of their accomplishments because you didn't do it. The same goes for their bad acts.
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My question has always been, Does it matter?
Outside of health risks or benefits, it shouldn't. If your great great whatever used to be a badass, that doesn't mean you get to be proud of their accomplishments because you didn't do it. The same goes for their bad acts.
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Yearam
If this is the case with ethnicity, then how accurate are the health results from DNA test kits? (i. e. 23andMe tells you whether you might be a carrier or if you have a stronger likelihood to get dementia for example)
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If this is the case with ethnicity, then how accurate are the health results from DNA test kits? (i. e. 23andMe tells you whether you might be a carrier or if you have a stronger likelihood to get dementia for example)
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Chieh
So the DNA test can indicate how represented a DNA is in our bodies and which DNA's are present, just not how many of my ancestors are from a specific region. It could also test for my species combination.
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So the DNA test can indicate how represented a DNA is in our bodies and which DNA's are present, just not how many of my ancestors are from a specific region. It could also test for my species combination.
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Michael
Science has proven that Europeans white skin and straight hair comes from Neanderthals. I dont know why they chose to give them dark skin here. Racism really crops up in the most unexpected places.
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Science has proven that Europeans white skin and straight hair comes from Neanderthals. I dont know why they chose to give them dark skin here. Racism really crops up in the most unexpected places.
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