What % of your genes do you share with a sibling from same parents?
- Thread starter pete6032
- Start date
shortylickens
No Lifer
- Jul 15, 2003
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Fun Fact: Particle radiation slowly mutates DNA, so even identical twins will differ more and more as they age.
Red Squirrel
No Lifer
I have a non twin sister who's quite older than me, we're both gingers. Not sure about other genes. That does not answer your question but it may provide a single data point. 
Actually it would be interesting to do something like 23 And Me test between siblings and compare both see if/how they differ.
Been kinda intrigued about trying that actually even just for myself. The medical related info could be interesting and I'm actually not too sure about my early ancestry and that would provide some clues. I suspect Irish but not too sure. Just something cool to know.
Actually it would be interesting to do something like 23 And Me test between siblings and compare both see if/how they differ.
Been kinda intrigued about trying that actually even just for myself. The medical related info could be interesting and I'm actually not too sure about my early ancestry and that would provide some clues. I suspect Irish but not too sure. Just something cool to know.
sandorski
No Lifer
- Oct 10, 1999
- 70,727
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I have a non twin sister who's quite older than me, we're both gingers. Not sure about other genes. That does not answer your question but it may provide a single data point.
Actually it would be interesting to do something like 23 And Me test between siblings and compare both see if/how they differ.
Been kinda intrigued about trying that actually even just for myself. The medical related info could be interesting and I'm actually not too sure about my early ancestry and that would provide some clues. I suspect Irish but not too sure. Just something cool to know.
Repressed latent desire to get into his Sisters genes. :Freud:
highland145
Lifer
- Oct 12, 2009
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There was a story about natural triplets, non invetro, and there was a 15 to 20% difference on some of the ancestry.
If you can stand the site....http://www.thedoctorstv.com/articles/3863-the-triplets-put-ancestry-kits-to-the-test
If you can stand the site....http://www.thedoctorstv.com/articles/3863-the-triplets-put-ancestry-kits-to-the-test
sdifox
No Lifer
- Sep 30, 2005
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https://www.quora.com/What-percentage-of-human-DNA-is-shared-with-other-things
That says genome delta from one human to the next is only half a percent.
That says genome delta from one human to the next is only half a percent.
zinfamous
No Lifer
- Jul 12, 2006
- 111,803
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oh....dear. Are you now saying that humans have 46 chromosomes? D:
No.
Mom gives half of her alleles, dad gives half of his. you still have 23 chromosomes, just like your parents, and just like every other human. siblings are the most genetically related of all relationships. Siblings are 1/2 related, whereas you are 1/4 related to your parents, and so on and on. (but yes, you are correct that it is 50% between siblings, you are just thinking about it wrong.
)The correct answer is 0-100% (only counting the parts that can vary between people since we're all 99.5% the same info) but with the extremes so unlikely that it is safe to just say 50%. At each location that varies, there is a 50% chance that a sibling will get the same copy you did from the father and a 50% chance that the sibling will get the same copy you did from the mother. (So 25% chance that none are the same, 50% chance that one is, and 25% chance that neither are). Extrapolate this out to 5 million different sites and you can see how it is going to be ~50%. Random mutation counts are low enough that we can ignore it here.
That's just accounting for the diverse areas though. If we want to look at everything, you're not much closer to your sibling than you are to every other human. You're ~99.5% just like your worst enemy, and only ~99.75% like your sibling.
That's just accounting for the diverse areas though. If we want to look at everything, you're not much closer to your sibling than you are to every other human. You're ~99.5% just like your worst enemy, and only ~99.75% like your sibling.
Those two might be the same person, mind. Particularly if you were in a rock band together, it seems.
highland145
Lifer
- Oct 12, 2009
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- Dec 11, 1999
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justoh
Diamond Member
- Jun 11, 2013
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Enough for you to be worried, OP, at least if you have any family, are prone to murdering people, and have family prone to murdering people. Say you're careful and cover your tracks, but leave some dna behind because of one careless moment, and further, that a member of your family has dna stored in a database, because they were careless. In this case they would be able to get a partial match between your brothers profile and that found at the crime scene. Any decent detective is probably going to go after one of their siblings, ie. you. Be careful out there.
You might get what your father got from his father or maybe what he got from his mother, the same randomness from your mother and your siblings the same randomness.
Not with the posed "non-identical twin sibling" restriction in the first post!100% happens surprisingly often. 0% only happens in the movies.
Thebobo
Lifer
- Jun 19, 2006
- 18,574
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