It is a silly myth that Israel doesn't allow generations tests, Israel being at the forefront of genetic testing. Gene testing occurs all the time, very common prior to marriage. What Israel bans the sale of- like many other countries- is third party providers of gene testing who do not have secure data storage. The fact 23 and me, a leading provider, had its database leaked with Jews specifically targeted, validates Israel's concerns. There has never been a people more gene tested than Israelis, which confirms the origin of Jews in the Levant.