Thanks to @emjosephs @popgenchen @vsbuffalo @JeremyJBerg @sivan_yair & @gbradburd for comments, & talking me out of making book analogy even more ellaborate
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Prikaži ovu nitHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi
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In other news I made a gif, scroll down blog, but I'm too much of a luddite to know how to post it to twitter
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So any genealogical ancestor past 14 generations is likely to have contributed 0% to your genes?pic.twitter.com/j6jkuM2X2w
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Yes. Your genome is there, just scattered across the (minority) of you 2^14 ancestors.
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Is it because the estimated number of ancestors approaches total estimated human population sizes that you infer that we all descend from everyone living at that time?
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Yes so that's the basic intuition. But that can be backed up by genetics and detailed sims see:https://twitter.com/graham_coop/status/943316212334845953 …
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Superb! I teach a simplified version of this to my middle schoolers... with 46 chromosomes, and hundreds of geneological ancezters, they couldn't ALL have contributed... even adding in crossing over in meiosis. Thanks!
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That's wonderful, I imagine that blows a few minds! Feel free to borrow any figures. I'll put them all under a CC by license to allow broadest use.
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really interesting! Helped me get more intuition. One thing that isn't clear to me is how well this relationship holds when the number of genealogical ancestors is constrained (due to bottle-necks, finite population size etc).
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So as long as log2(N)>> # generations it doesnt matter. But yes I you run into finite population quickly. Then you are descended from everyone many times over, the number of routes back to an ind is ~proportional to prob. you are genetically descended from them
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Čini se da učitavanje traje već neko vrijeme.
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