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Here's a random brain teaser for you!

emiliemadisonemiliemadison member
in Babies: 9 - 12 Months

If your mother's brother has a child with your father's sister, how much more genetic material do you share with their offspring versus what you share with a traditional first cousin?

 

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Re: Here's a random brain teaser for you!

  • PoetSorrowPoetSorrow

    Roughly speaking.... You share half of your genetic material with a full traditional first cousin... If your mother and her brother marry a brother sister pair.. technically you share the same amount DNA as siblings would.

     

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  • emiliemadisonemiliemadison member
    imagePoetSorrow:

    Roughly speaking.... You share half of your genetic material with a full traditional first cousin... If your mother and her brother marry a brother sister pair.. technically you share the same amount DNA as siblings would.

     

    Sorry, try again!

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  • PoetSorrowPoetSorrow

    I still get this.

    image 

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  • kellyperk85kellyperk85 member

    I am getting 1/4 more genetic material than the traditional 1st cousins.

    ETA:  Wait .. it's the same amount.

    Shiit, now I'm getting confused.

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  • emiliemadisonemiliemadison member

    I had to draw it out myself, LOL! It's a mind bender for sure.

    You share a 1/2 genetic relation to your parents, a 1/4 relation to your aunts/uncles, and a 1/8 relation to your first cousins. So if your maternal uncle has a child with your paternal aunt, you would up that percentage by 1/8, giving you a 1/4 genetic relation to that child (which is 1/8 more than a traditional 1st cousin).

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  • PoetSorrowPoetSorrow

    You share half with one parent but you share 100% of both parents. Thats where it's off at least in my head.

    You are 50/50 mom and dad... and your sibling would be the exact same as you. so you and your sibling are 100% the same. 

    You can't share only half of your dna with both parents... where did the other half come from then?

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  • emiliemadisonemiliemadison member
    imagePoetSorrow:

    You share half with one parent but you share 100% of both parents. Thats where it's off at least in my head.

    You are 50/50 mom and dad... and your sibling would be the exact same as you. so you and your sibling are 100% the same. 

    You can't share only half of your dna with both parents... where did the other half come from then?

    The only single person you could share 100% genetic makeup with is an identical twin. And it is confusing because you GET 100% of your genetic material from your parents combined, but your parents are separate people so you only share  50% of your genetic  makeup with each parent.

    Two siblings are about 50 percent related. You're not 100 percent related, even though each parent gave them both half their genes, because the chromosomes are not directly copied in order (like with identical twins), but are randomly sampled every time. Therefore, on average, siblings will share 50 percent of the random results. Also, it's slightly skewed by the sex chromosomes: males are always slightly more related to males, and females to females, in terms of sharing genetic material.

    And, of course, this is all just an 'average ratio' of shared genes ;)

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