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If genetic testing can show that someone doesn't have a predominance of Jewish genetic markers (say as little as 20%) , do they need to convert to be considered Jewish by the Orthodox rebbes in Israel?

The last time I went to a Jewish Genealogical Society convention, there was a lecturer about genetics. Much of the information was similar to what Elan has posted. Interestingly, this lecturer said that a few percent of these genetic tests end up showing a "false paternity," i.e., that someone's father or grandfather really wasn't, biologically speaking. Then again, maybe someone was switched at birth in the hospital. ;)

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