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How much DNA do siblings share?

gim
in Genetics

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I figured, and it seems to be right, that on average, siblings will have 50% of their DNA in common. The words "on average" are important here, because they may share more or less that 50% of their DNA.

 

What I can't figure out is this. Say I have two siblings. If I look at their combined DNA, how much of it will be the same as mine (on average)? Obviously more than 50%, but less than 100%. This is a statistical thing, and I would like to be shown how to work it out.

 

Thanks,

Greg.

  • 3 weeks later...

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