Global DNA variation of humans is about 0.5% of genes.[1] So I think that implies an average Brit shares 40% of that 0.5% with the average French. 0.4*0.005 ==

Global DNA variation of humans is about 0.5% of genes.[1] So I think that implies an average Brit shares 40% of that 0.5% with the average French. 0.4*0.005 == 0.002 -> 0.2% of the genome. Funnily, as a casual observer I would agree that the English language is 40% French (vocabulary) and 26% German (structure). [1] https://en.wikipedia.org/wiki/Human_genetic_variation https://en.wikipedia.org/wiki/Human_genetic_variation