Like every other people and nation, Jews are a mix of different communities. Some communities have no genetic connection with the main tribes (Ashkenazi, Sepharadi) and are probably converts from a long-forgotten event. The Ethiopians for example have no drop of Jewish blood. In Israel, businesses where you can send a sample and they tell you who were your ancestors and if you have unknown brothers and relatives, are totally forbidden. You can send a sample to America and receive information about your American relatives. But not in Israel. I imagine that that is because this information would create severe family conflicts and even ethnic wars, as the Ashkenazi government of the fifties has been accused of arranging the secret adoption of babies of ignorant, semi-retarded, helpless Yemeni immigrants to childless sterilized European women. The intention was to make justice because the Yemenis had too many children that were unable to educate, while the adopted babies would be grown up in educated environments, like a kibbutz. The Social Service is still doing those transfers from addict parents, but it is done through a complicated bureaucratic and judicial process, like in any other Western democracy, but it is possible that during the independence war era, it was done without proper consent.
In our woke time, genetic identification is done super-carefully, except maybe in America, where they are truly honest and non-racists. Finding African ancestors can even help to be accepted into top universities and jobs. Here the idea is that we are one people, all children of Abraham, Itzhak and Yaakov, and it is useless to research further.
