Why You DON'T Have 25% of Grandma's Genes | DNA Inheritance Explained
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- Опубліковано 25 чер 2024
- Discover why you might not have fully inherited 25% of each grandparent's DNA. Genetic Inheritance is a numbers game and it can impact your genetic genealogy results.
🤩 How DNA changes Over 4 Generations 👉🏼 • How DNA Changes Over 4...
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Chapters
0:00 - Introduction
0:16 - Understanding Autosomal DNA
0:53 - DNA Inheritance from Parents
1:49 - DNA Inheritance from Grandparents
3:04 - Recombination and Chromosome Swapping
4:09 - Different Ways of Inheriting DNA from Grandparents
6:30 - Examples of DNA Inheritance from Grandparents
7:56 - DNA Inheritance Percentage
9:00 - Range of DNA Inheritance from Grandparents
9:45 - DNA Inheritance from Paternal Grandparents
10:14 - Summary of DNA Inheritance
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I share 50.8% with my father and 49.2% with my mother. I also share 27.8% with my grandmother from my mother's side and 22.2% with my grandfather.
And 38.2% with my brother.
That sounds about right.
excellent explanation! thank you so much!
Glad it was helpful!
Thanks for the clarification
No problem!
Thanks Andy great explaination🧬🧬
Happy to help
Fascinating! Thank you
It took me forever to understand this until I realised it's just from the fact you are going from two person's amount of DNA to one person's amount of DNA so half of it has to be chucked out simple as that.
Yep, every generation, half of it is discarded.
Aha! So it's not necessarily just your grandmothers, but it equally happens with your grandfathers. My parents are going to get 50% of random chunks from each of their parents, and I'm going to get 50% of random chunks (of random chunks) from my parents which will not necessarily be 25% from each grandparent but random.
You're not alone, I'm guilty of this. Glad to learn I was wrong.
Wonderful explain about DNA 🤩
Thanks
Well explained
Thank you.
My father had two half-brothers: one on his father's side and the other on his mother's side. The other brothers would not share any DNA in the 22 chromosomes.
I responded to your comment as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
So very interesting !! Wow, I didn't know the grand-parents mixing could be so heterogeneous at chromosome level. This maybe explains why I am the spitting image of my father's mother. This and another phenomenon : the recessive genes. You may have inherited such and such genes form both parents, but it doesn't mean they are gonna express if they happen to be recessive... Well, not too sure about it, though. If I get 23 from both parents (= 46), and I only can express 23, it means half of the 46 will be silent ??... 🧐
Thank you!
You're welcome!
Hi Andy,
All 4 of my grandparents have all passed away with only my Maternal Grandmother tested and I'm wondering is there a way to find out how much DNA I inherited from my Grandparents?
It might require a big shovel and a long night unless you happen to have some of their hair around or something.
@@ericray7173 i'm not sure if it works that way
You can phase your DNA using siblings. Have you seen this video? Visual Phasing Part 1: Setupua-cam.com/video/fHZGdifd4KY/v-deo.html
What testing company shows these specific recombined percentages?
No company shows the specific recombination percentages. Without your parents, grandparents, and preceding ancestors, there is no way to display such percentages. Most DNA test takers do not have all of those living predecessors to make that viable.
However, statistics and the study of genetics have demonstrated these percentage ranges to exist. A knowledge of the variance can help us understand why we don't have the same matches as our siblings, cousins, aunts/uncles, etc.
Hello Andrew, I had an account with Ancestry for 4 years. It never brought up my Paternal side. Not just my living family members but actually never displayed ANY Paternal members period. I have called the company and they want me to retake the test. Here's the kicker. My aunt who is my fathers only sibling also took Ancestry test. Her Maternal side has not shown up... weird right? Since 99% of DNA is all the same do you think I will get a better result if I retake this test? Thanks!
Full siblings actually only share about 50% DNA. I know it is weird but that is how it goes.
"Ancestry is offering you to retake the test to ensure they processed your DNA correctly. Chances are, they did (something I explained in a funny way in this video. ua-cam.com/video/bj2KCzW44qU/v-deo.html)
If you're not seeing results from one line, there are several potential reasons.
1. Your genetic relatives have not taken a DNA test at the same company you have.
2. Your genetic relatives have taken a DNA test at the same company you have, but they have not made their DNA results public.
3. There are not enough living descendants of your common ancestor to take a DNA test. ua-cam.com/video/pJDjHg13QgI/v-deo.html
4. Your genetic family tree isn't what you suspected.
By all means, take a test to ensure Ancestry was accurate. Then consider these options to guide you as to the most likely outcome"
So, you're saying there's a rare possibility that I could inherit 50% from one grandparent and the other completely left out?
I wouldn't say you'd leave the other grandparent out entirely. But yes, there could be an imbalance in how much you receive from your grandparents.
Any, but if it happens that an individual who can be either from his mother or from his father, can inherit 50%, then exclusively the genes of his grandfather or even only the genes of his grandmother and none of the other will not be an abortion?Any, but if it happens that an individual who can be either from his mother or from his father, can inherit 50%, then exclusively the genes of his grandfather or even only the genes of his grandmother and none of the other will not be an abortion?@@FamilyHistoryFanatics
@@FamilyHistoryFanaticsDoes every individual, all of us, inherit both the genes of our grandfather and our grandmother on both our father's and our mother's sides?Does every individual, all of us, inherit both the genes of our grandfather and our grandmother on both our father's and our mother's sides?
Ummm Andy there are not video links at the end of this video. You are still just pointing at air when we view.
I'll get on it JR E. We've massively increased our content and some things are slipping through the cracks. Thanks for being such a loyal fan and reminding us to stop pointing at air.
can i inherit my great grandparents height genes? Like mostly there short same with my dad but my grandmas dad from my moms side is tall like around 6 foot tall, and I mostly resemblance my moms side
Could I get that tall from my great grandfather?
My father is 5'8 and my mother is 5'5
Genetics and height is a complicated mix. But height of grandparents can impact children. I know a woman who a giant compared to her siblings. It turns out these are her half-siblings and her biological father's family has tall individuals.
Meanwhile, of my two daughters, one is the same height has her grandmothers on both side. The other is as tall as my wife, who is taller than her mother and her grandparents.
Hello
I wanted to ask what was the best DNA company to use for researching if you may have children that you were not aware of. For example.. being in the military.. im asking, I think I may have a son, I never knew existed. He's my mini-me genetically and behaviorally..but for clarity I wish to find out the truth for peace of mind. Thank you in advance.
If you have access to his DNA and yours, any company will work because this is such a close relationship. If you're trying to find them, then you need to test in all of the companies because you don't know where they'll test.
So what about full blood siblings?? It’s just the luck of the draw basically & we get different combinations?
Check out this video about How Much DNA Do Siblings Get From Their Parents?ua-cam.com/video/L3yxQ36awUM/v-deo.html
Then let me know if that answers your question or not.
1:31 22 Divided by 44?
I got a grandparent/half-sibling/avuncular match from someone unexpected. We're showing sharing 22.61% DNA (1639.49 cM.) They're definitely not a grandparent. That leaves a half-sibling or avuncular. Is this level of DNA possible for a half uncle or a nephew from a half brother? That's the only type of avuncular match this person could be to me if they're not indeed a half-sibling.
"According to the Shared cM tool, a half-uncle or nephew of a half-brother is out of range for 1639 cMs. dnapainter.com/tools/sharedcmv4
Now, there is a genetic genealogist that thinks this chart has some flaws. It's possible that the relationships you seek COULD be accurate, but at the moment, I'm not going to concur with the possibility."
I look very similar to my maternal grandfather. Does that necessarily mean I have a lot of shared DNA with him? Or could I just have a little but have inherited certain genes?
Perhaps. But only a small amount of your overall genetics is related to your facial features, your skin tone and hair colour or type.
Looks are a combination of multiple traits not necessarily the quantity of DNA you received from Grandma. For an interesting video about inheriting traits, watch this one. ua-cam.com/video/UwfOzWJax_A/v-deo.html
Thank you both for the information!
I have a question. My great grandmother on my maternal side was half Chinese. I did a DNA test with Ancestry and it showed I have 4% Chinese. I know it’s from her because of my 8 great grandparents, I know for a fact she was the only one who had Chinese. Is that a normal range for me? Since my great grandmother was APPROXIMATELY 50% Chinese, would me being 4% be accurate? Or at least fit within the normal range of inheritance? Thank you in advance. 🙏
It's entirely possible that you have more Chinese ethnicity that what is currently in your results. The problem with taking DNA tests for ethnicity percentages is that the entire Asian region is under presented. As such, you match a small segment of the people within the reference population, but that's even a large enough fraction of the Chinese DNA in existence today.
Thank you for your insight kind sir! Thank you for responding to me! 😊😊😊
Btw i am a big fan of all of your videos
It would be what was expected with average split in each generation, a great great grandparent would be about 6.25% of your DNA.
My sister looks just like our grandmother and we both took a DNA test and she shares 37% of her DNA and I only have 25%! It just depends who you favor the most I guess.
25% is an average, there is a range of DNA you can inherit from grandparents that can include 37%. And als low as 17% that I've seen.
If you have 50% of the genes of each parent, then you must have the 25% of each grandparent.
That's the projected math, not the biological reality.
I share 22% with my maternal grandfather... and 11% with my maternal grandmother. This seems impossible. Aside from chimerism, is there ever any way for someone to share less than 35% of their DNA from one set of grandparents, or only 11% with one grandparent? I can't imagine there is, but...
The only way both of them could be related to me without my grandmother being my grandmother is if my grandfather impregnated her much older, married-with-kids sister, who lived in a different state, a couple of months after he married my grandmother. And then my great-aunt would have had to admit what happened or come up with some other excuse to give my mother to my 20 year old, newlywed grandmother rather than simply raising her with her other kids and passing her off as my great-uncle's. And then my grandmother would have had to be so okay with this, that she would go on to have several more children and 50+ years of a very stable, loving marriage with him despite divorce very much being an option from both sides of the family. AND my loudmouth family, which loves to drink and dig up old skeletons during family reunions, would have had to keep it a secret for decades.
My great-grandmother was well into menopause by the time my mother was born, and I don't think they had much contact with extended family so I don't think my grandfather would have even met any of my grandmother's cousins or other close relatives. There just simply aren't other options for who my grandmother could be.
So, faulty results? Medical anomaly? The most nonsensical case ever of someone secretly raising their sibling's kid? I really want to make sense of this, any real suggestions are welcome.
11% seems outside the realm of possibility for a grandmother. You would have to compare yourself to other descendants of your great aunt as well as your cousins from your grandmother's other children in order to confirm whether the situation you describe is correct.
No, there is no way you can have less than 50% from a pair of grandparents (because you got 50% from each parent).
@Family History Fanatics hi, my grandmother is moroccan and turkish and recently I find out I only inheritage 16% ethnicity, and only 5% turkish.
Does that mean I'm not turkish at all?
I've been working on my DNA matches in Ancestry. I have a 2nd cousin once removed that I match at only 13 cM. How is this possible? I look at DNA painter and it says 0% chance. My mom's DNA is in Ancestry. She matches this 2nd cousin at 129 cM. That seems right. How can the drop off be so big from my mom to me in this case?
I answered your question as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
something similar happened to me. I only share like 30 something CM with my mom 2nd cousin but I share 109cm with my mom half second cousin. on paper I should be more relative to the other cousin but DNA says otherwise. I think i just took more DNA form the part of my mom that shares DNA form that 2nd half cousin then the full 2nd cousin.
This steep drop can happen, I have something similar, but I think it is a grandchild of a second cousin that matches at 7cM.
I have a situation that is really baffling me which led me to your UA-cam channel. My Grandmother and her ancestors were all from German and Norway but on Ancestry and 23 and me I am 0% German or Norwegian and I don't understand why. I have DNA matches on Ancestry where we share 4th Great Grandparents but they are all on my Grandfathers side and there are no DNA matches on my grandmothers side. There are also no matches more recent than 4th GG. I don't believe anyone is adopted because of family resemblances so how could this be possible?
Someone is wrong about their nationality, someone somewhere.
I got 30% from my paternal grandfather, that’s quite a lot I think..
Now what I actually find weird though, is that I got 19.3% from my paternal grandmother..
how does that even happen?
I tested both grandparents and myself, and I have a cousin from the other side of my family who is pretty accurate around the 12.5 mark.
Did the rest 0.7% not get recognized because it is mutated enough from one of my grandparents (or both)?
I dont know who my biological father is. My 19 year old daughter just had an ancestry dna test done. Its come back 24% irish. There are no irish relatives on her dads side and no irish on my mothers side. Does this mean my father/ daughters grandfather was possibly irish or maybe one of his parents were?? Hope this makes sence as i struggle a little bit with understanding how it works xxx
Test yourself, you may be surpriced that there are in fact some Irish in there, or her father may. I didn’t know and still don’t know where the 20% Irish/Scottish/Welsh came from by looking only at what we know from our family history.
I then had my grandma and grandpa tested, and at least some of it likely came from my grandma, while I almost have double the amount she has.
My brother doesn't show as a match in the group I share with my son. Can he still be my brother?
He will always be your brother but it's possible that he's not genetically your brother.
What about people who are mixed? You aren't going to inherit as large amount of dna. For example, I am 3% African per Ancestry. My great grandma appears to have been mixed. I am still working on this. My uncle gets 7 % African or so. This would be his grandmother. We also have a great and great great grandpa from Austria Slovenia. I only got 1% Eastern Europe and Russia which says includes Austria and Slovenia. Shouldn't I have more than 1%??
Austria/Slovenia might be included with a German ethnicity if you have that.
I have a bunch of German from both sides. Well maybe not a bunch but enough. My maiden name is Witt.
It's weird I look 100% Mediterranean ,so does my dad's side. But our lineage is from France Paris/latin quarter, wallonia , champagne and norde pas callais but we can pass for Greeks or Italians it's crazy . I'm confused
I responded to your comment as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
@@FamilyHistoryFanatics thank you guys so much. I love the video and I'm sorry for not writing the question better 💪
@@robbiee.6921 How far back have you traced? Italians and Spanish have been emigrating to France for hundreds of years. Have you tested commercially? Ancestry is not so good for France, but if you have Italian or Spanish it will probably pick this up reasonably accurately, 23andme may do better.
@@willjohnson353 I'm going to do 23 & me
@@robbiee.6921 Great :)
Is there ever any true variance with the 50% shared with parents? I ask because although Ancestry says 50% between me and my father, MyHeritage only shows 49.6% between me and my mother. MyHeritage also shows less than 50% between me and each of our tested children: 49.9%, 49.8%, and 49.7%. It is the same on MyHeritage for my husband and his mother, 49.8%, not 50%. Ancestry shows all of these relationships as 50%. It doesn't make a difference whether it was a native MyHeritage test or a transfer. All show less than 50%. Why the difference between the two companies?
Yes, there is a range. Often 50% is used to 'simplify' the math for beginner genealogists. In actuality, it causes more confusion than necessary.
@@FamilyHistoryFanatics Thank you. Yes, it sure does! And, I sure don't need any more help getting confused. haha
È dovuto a mutazioni.
How are you able to tell that the blue line is your grandfather? Did you do a DNA test on him?
Yes, I have tested both of my paternal grandparents.
@@FamilyHistoryFanatics merry Christmas Larry. You lucky man to have that generation to test.
How would it work when you come from a large family? I have 12 siblings. Half are full siblings and half are half siblings.
It would make no difference how many siblings you have. You inherit 50% from each parent. 25% from each grandparent, etc. If you reach into a bowl of M&Ms and you pick out a handful, count what you got, throw them back in and your handful will not match the handful your sibling pulls out.
I answered your question as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
I have yet to take a dna test for ancestry, (multiple reasons). When looking at the nationality results from some of my Daughters siblings I see that they average 4% Chinese. My Ex is Samoan. I know it’s a long shot but is there a possibility of knowing how far back that 4% Chinese is? My side of the family was easy, no surprises but we thought it was cool to find tiny percentages from Asian countries. (Yes we know there tend to be kinda high percentages mixed with Asian and Polynesian nationalities. We’re just curious if it could be found out how far back the Chinese dna was.
I discuss this question a bit in this video ua-cam.com/video/9hbE4Vihf4g/v-deo.html
The short answer is, it's rather difficult.
The other caveat (with the Samona heritage) is that Pacific Islanders and Asian populations are under represented in reference populations. ua-cam.com/video/ScZtHuU78n4/v-deo.html
It's entirely possible that you have more or less of that ethnicity than what your current report says. Only time will tell and you can expect more changes to the results.
I recommend that you instead build your family tree using genealogical records (as much as possible, which might be difficult with your Samoan heritage. It's my understanding that they don't keep a lot of written records). Then, use DNA matching to find out how you're related to others who have tested. Pay close attention to matches that share more than 40 cMS. ua-cam.com/play/PLcVx-GSCjcdmsw25mbI-wJin_9_9QQUzI.html
I would like to know why you didnt focus on the Maternal Grandparents instead?
Because the same principles apply to both the maternal side or the paternal side.
Hi am i sharing my dna with my all greatgreat-grandparents?
Almost certainly, you have a little DNA from each of your 2nd great grandparents.
@@FamilyHistoryFanatics thank you
And wich dna I need for this method? My 4 grandparents are not alive anymore. My Dna is on My Heritage and also from my daughter. Can I get this kind of results only with our dna? Great video again. 👍👍
I answered your question as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
@@FamilyHistoryFanatics You are the best.... Gonna watch that video NOW 🎉🎉😄
Does this mean its theoretically possible to not be related to one of your grandparents?
Grandparents? Not necessarily. If you share no DNA with a grandparent (which is a close relationship), you're either not related to the grandparent or their child (or potential parent). The point is, folks think they should share exactly 25% of their DNA from a grandparent, but that isn't accurate. You could share 20% your mother's mother and 30% with your mother's father and that would still make your mother's mother your grandmother.
This is where I get lost. When something is all black and there is no match across the dna bar, how do you know which one it is pointing to?
It means there is no match. I answered your question as part of this livestream ua-cam.com/video/jhoPtxB-TJY/v-deo.html
@@FamilyHistoryFanatics I know what you said in the livestream, so my question was not clear. For example, on a one to one, a person matches me in "blue" then the black shows up on the bar. I understand that the black means there is no match. Does that mean in the spot that is black that it is from the person's other side? Example we match on my mom's side and it shows blue and would the black be on her family on the other side which is not mine? Hopefully, I am a little better explaining what I am asking. LOL
My parents and all my grandparents are dead except my maternal grandma and she gas Alzheimer's in a nursing home. So I will never know.
And my sister is only a half sibling.
That's possible. Sadly, DNA leaves so many of us out because of the lack of available test takers.
Hello can you please tell me how to learn my ancestry from my grandmothers father specifically? Thank you i am male. Grandparents are gone but i have male uncles, if that helps
(Male uncles ha im leaving it)
To get these percentages, I assume that your parents and grandparents must be DNA tested?
Not really. Part of the answer is a theoretical use of numbers. Part of the answer utilized my family's DNA to compare to the theory.
why is it I don't have central and eastern china ethnicity yet my paternal great great grandfather is from china?
Check out this video: Blame Reference Populations if Your Ethnicity Results Are Wrong ua-cam.com/video/ScZtHuU78n4/v-deo.html
@@FamilyHistoryFanatics thank you
Huh?
..you have 4 grandparents.
..and so, you do not know if it is paternal or maternal grandparents match without their DNA data.
I'm not sure I understand your confusion. Writing out our questions is such a challenge.
We can determine how people are related and through which grandparent using several comparative tools. One such tool is the Leeds Method ua-cam.com/video/-74LJyjqo9c/v-deo.html and another is called clustering ua-cam.com/video/hpzQjqGmOeo/v-deo.html
The 50 percent doesn't always show up My Heritage.
What if 3 of your 4 grandparents were 100% Irish. And one of them was German and French. But your DNA results show zero German and zero French. Confusing
Not a match can also be mutated between the two enough to be different
Universal.org
I came to the conclusion that we are only related to half our grandparents since we only get one set from each and unless it is mixed we only get half of them.
Me who has 2 fully European grandmothers, and 2 fully Asian grandfathers: "👨🦲"
Cool. That makes your family tree and genetics rather interesting to be sure.