You can look at autosomal DNA admixtures to get an estimation of the percentage of genetic ancestry from different groups . YDNA haplogroups can be misleading due to polygamy and men taking wives from another group after the men were killed or enslaved , which caused YDNA haplogroups from the conquering group to proliferate , yet genes from the conquered group were still passed on maternally . You can see evidence of this with the ANE admixture brought by the IndoEuropeans being quite low despite the high percentages of Haplogroups R 1 a and R 1 b . <| sep |> Even if hexapods evolved from a crustacean ancestor , that doesn ' t make them crustaceans . That ' s not how it works . Besides , I didn ' t describe any theory . What I have stated is the current general consensus of the scientific community . There is ongoing research to determine whether or not crustaceans are truly a monophyletic group , but it is not up for debate whether or not a grasshopper is a crustacean .