Autosomal DNA recombines at every generation, so instead of having one ethnic association, a person will typically be an admixture of several ethnicities. It all depends at what level we compare "ethnicities". It is very easy to distinguish European, East Asian or sub-Saharan African autosomal DNA and give a percentage for each. Middle Easterners, Indians and Central Asians will usually have a strong admixture of European and East Asian.
New comparative studies make it easier to distinguish between northern, southern, western and eastern Europeans, for example, but at present no (commercial) DNA test can give the admixture at a national or regional level. It will come in due time though.
Not yet, or at least not accurately. It is also important to keep in mind that language groups do not often coincide with genetics. For example, Moroccans, Tunisians, Egyptians, Lebanese and Yemeni are all Arabic speakers, but all completely different in terms of DNA. On the contrary, Turks and Greeks may think of themselves as ethnically different because they speak a completely different language and have a different religion, but their DNA is very close. That's why it would make more sense to use a single Greco-Anatolian ethnic group for regional comparisons.In a summary:Can autosomal-DNA test show which part of divisions were your ancestors frm like slavic,celtic,germanic,latin,semitic,uralic ....ext?
I don't understand your question. What do you mean by "fit" ? It is possible that two people with completely different autosomal DNA have the same Y-DNA and mtDNA haplogroup, but unlikely.3-Is it fit to be a two persons have the mt-DNA and Y-DNA haplogroups`subclades but different in autosomal-DNA?I mean Is it to fit that two persons have the same mt-DNA HAPLOGROUP (H1a as an instance) and the same Y-DNA haplogroup (R1b as an instance) but differ in autosomes (one of them is 70%middle eastern and the other 70% northern european)?
At present, the only benefit of X-STR tests is to confirm that two individuals are related within a few generations. It may be useful for a woman who was adopted and wants to know if someone is really their biological parent or sibling. But it's more effective with a full-scope DNA test like 23andMe. X-STR alone is already outdated.4-I know that X-chromosome is recombined through generations so it is difficult to make SNP test for it so Could you tell me what the benefit of X-STR test then is?