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Jul 15, 2020
11:23
:19
pm
tjngirlz
All-American
My MIL found her siblings through Ancestry
Turns out her mother and biological father had an affair. She is 4 months older than her half-sister.
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tjngirlz
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tjngirlz
Joined
Jan 11, 2002
Last login
Jun 30, 2023
Total posts
5,388 (64 FO)
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Messages
Author
Time
How do 2 siblings (same 2 parents) get slightly different DNA/ancestry results?
byu1
7/15/20 9:30pm
UPS?
CarolinaCoug
7/15/20 9:31pm
Not UPS, USPS, Fed Ex, And DHL wasn’t even around back then
byu1
7/15/20 9:32pm
Pony Express. The bigger the better.
TheWoodman
7/15/20 10:13pm
Kids don’t actually get identical genetic packages from their parents.
Joe Banks
7/15/20 9:32pm
Right. But how can this be
byu1
7/15/20 9:33pm
Because your mix of DNA is unique to you
JOPE
7/15/20 9:45pm
Your kids got half your DNA and half your wife's. That means you each have
molodyets
7/15/20 9:45pm
<< Deleted >>
Joe Banks
7/15/20 9:50pm
...brother from the father's brother?
boogers
7/15/20 9:32pm
Because DNA comes in packets - not all packets are the same.
ClackamasCoug
7/15/20 9:33pm
Grandma was a floosy?
Nat Gas Man
7/15/20 9:33pm
A few years ago there were identical triplets that all got significantly
Lance71
7/15/20 9:34pm
No, DNA doesn’t work that way. For example
JOPE
7/15/20 9:40pm
I found out 2 Yrs ago that my grandpa fathered a child no one knew about. Turns
Iman23
7/15/20 9:46pm
Care to share? Sounds interesting. The discovery part I mean
gmj81
7/15/20 10:07pm
<< Deleted >>
kotacoug
7/15/20 10:09pm
My grandpa’s brother fathered a child we found this way. At the age of 68 my dad got a new cousin out of nowhere.
mvtoro
7/16/20 12:04am
math
BlueFrog
7/15/20 9:50pm
Crazy story about this with my neighbors
stgeorgecougar
7/15/20 10:00pm
My MIL found her siblings through Ancestry
tjngirlz
7/15/20 11:23pm
Siblings don’t inherit the same 50% of DNA from each parent.
chilango
7/15/20 10:06pm
Let's say each parent has 100 genes. Each kid gets 50 genes from each parent
Chasicle
7/15/20 10:28pm
Thanks. That’s the best explanation I’ve heard
byu1
7/15/20 10:50pm
This is right. You only share 50% of your variable genetic material in common with any sibling.
mvtoro
7/16/20 12:06am
*on average. You can share more or less depending on which chromosomes you inherited.
durandal
7/16/20 12:25am
Sure. But for the purposes of this question it doesn't really matter if it's 50, 49, 51... It's about the fact that only
mvtoro
7/16/20 5:10pm
Unlikely. It’s not like if I didn’t get my sister’s specific danish gene
Chasicle
7/20/20 7:48pm
Your example presupposes a high percentage of Danish genes overall in the genes of both parents. The likelihood of
mvtoro
7/21/20 12:13pm
My point is that you're not going to get something
Chasicle
7/21/20 3:33pm
For percentage of geographical distribution of genes, you're right. It won't look like you're 50% "different" in terms
mvtoro
7/23/20 12:25pm
So why the big fuss over incest? 🙂
Cougar Junkie
7/16/20 12:41am
The replies above are right, but they don't really address the primary
Pedant
7/15/20 10:35pm
Every person has two sets of chromosomes, each set with 23 chromosomes. One set is inherited from mom, one set from dad.
durandal
7/15/20 10:48pm
See the wiki page on homologous chromosomes:
durandal
7/15/20 11:03pm
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