You're right about the relative similarity (and that's the key point), wrong about the number of chromosomes being involved in the 25% calculation. It's about t

You're right about the relative similarity (and that's the key point), wrong about the number of chromosomes being involved in the 25% calculation. It's about the proportion of bases (letters in the sequence) that can differ between two people that actually differ between these two people. See mbreese's comment: https://news.ycombinator.com/item?id=8293159 https://news.ycombinator.com/item?id=8293159