the khazars were a warlike tribe in the general area of the ukraine about mid way thru the first millennium and converted en'masse to judiasm at the command of their ruler.  this article speaks of more information on that;

Palestinians may be

the actual descendants

of Biblical Hebrews

In 2001, Dr. Areilla Oppenheim of the Hebrew University in Jerusalem,

conducted the first comprehensive DNA study of Israelis and Palestinians.

She concluded that Ashkenazi Jews were of Mongolian 40% and Turkish 40% genome.

Today's DNA testing services such as "23andMe" allow for normal people to provide a saliva sample which is tested in a lab.....and voila!....your ancestry can be broken down into percentages with quite accurate results. 

My sister had it done, and the results were what we'd thought they'd be based on what we knew about the ethnicity of our parents, grandparents, and great grandparents.  So how simple would it be for today's Ashkenazi Jews to take such a test en masse to determine their percentage of Semitic heritage, and thus verify their claim on Israel?

Well, that's been done already, and it's not surprising we haven't heard much about these studies...........more.........