math

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Jul 15, 2020
9:50:08pm

BlueFrog Hall of Fame

math

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BlueFrog

Bio page: BlueFrog
Joined: Sep 5, 2010
Last login: Feb 17, 2021
Total posts: 102,537 (26,273 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?

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.

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

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? 🙂

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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