DNA base pair counts vary between species, so some edit distance (https://en.wikipedia.org/wiki/Edit_distance https://en.wikipedia.org/wiki/Edit_distance) would

DNA base pair counts vary between species, so some edit distance (https://en.wikipedia.org/wiki/Edit_distance https://en.wikipedia.org/wiki/Edit_distance) would be better. You’d have to solve the problem that chromosome counts vary, too, though (in animals from 1 for the male jack jumper ant to over 500 in the Atlas blue butterfly. See https://en.wikipedia.org/wiki/List_of_organisms_by_chromosome_count https://en.wikipedia.org/wiki/List_of_organisms_by_chromosom...)