In old times Arab and Somali and Islamic culture it is the male line that defines ones ethnic and group. Of course this is also Islamically re-enforced. Some other cultures in the world also hold this view. Now can we say this is backed by science? We all know paternal Haplogroups is a determining factor when it comes to ones background and ethnic, because a female maternal Haplogroup is hard to trace after certain time period. So what do you guys think. Does science back up the argument identity is determined by paternal descent? (I said identity and not DNA)