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Thread: Recombination odds

  1. #1
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    Recombination odds

    I've been reading a lot about recombination, but these questions remain:

    We get roughly 25% DNA from each grandparent, but what is generally-speaking the maximum difference?

    Roughly what percentage of people might be beyond that maximum?

    Are there any known cases of extreme difference?

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  4. #3
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    I recall a user on the 23andme forums getting 50% from ONE GRANDPARENT.

    While of course this is astronomically rare, such extreme recombination can happen. There have also been instances of people not inheriting any DNA from ancestors as close as their great-great grandparents.
    Target: mildlycurly_scaled
    Distance: 1.3578% / 0.01357814
    57.0 Irish
    37.6 English
    2.6 Roma_Barcelona
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    Quote Originally Posted by Slimm623 View Post
    Are there any known cases of extreme difference?
    This article discusses a possible case:

    In this blog post we will briefly review an extreme Grandparent/Grandchild relationship, where a grandchild appears to share just 9% of her DNA with a paternal grandmother rather than the expected 25%.
    https://thegeneticgenealogist.com/20...mounts-part-2/

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