Saying this as a non-expert, the percentages are obviously taken over different gene pools (e.g. there is no reason to count genes in common with a chimpanzee when you are comparing two humans or two siblings.)
Saying this as a non-expert, the percentages are obviously taken over different gene pools (e.g. there is no reason to count genes in common with a chimpanzee when you are comparing two humans or two siblings.)