Abraham had more than two sons, Moses' second wife was an Ethiopian, Solomon had a son with the Queen of Sheba, and etc. Therefore the fact that DNA analysis can show African, Turkish, Kurd, and etc. descent from the Jews is to be expected. Also, you seem to want to ignore this from "The Thirteenth Tribe:
http://www.christusrex.org/www2/koestler/k223.html
Here is another site that appeals to primary sources that contradict the conclusion drawn by your primary sources:
http://www.sullivan-county.com/identity/khazars.htm
As to your attempt to show that DNA analysis can show that homosexuality is genetic is superficial and has been shown to be false by molecular geneticists including Hamer, the man whose published study started the gay gene myth. Hamer never claimed to have found a gay gene. The liberal media reports on and spins only initial studies that support there egalitarian, liberal bias. Homosexuality is a behavior that is influenced by many factors, not the least of which is personality, which does have a genetic component.
Also your cavalier dismissal of how Catholicism has spun history tells me that you have an agenda with this thread that has nothing to do with a search for truth.