Are Today's World Jews Directly Descended from Abraham?

I am curious about ethnicity and race. This question is for a Jew. I know in the Diaspora Jewish people were scattered throughout Spain, Europe, Russia and so forth. Are today's Jews the same race as those in the Bible, beginning with Abraham, or have they mixed with other ethnicities in various countries? ... show more I am curious about ethnicity and race. This question is for a Jew. I know in the Diaspora Jewish people were scattered throughout Spain, Europe, Russia and so forth. Are today's Jews the same race as those in the Bible, beginning with Abraham, or have they mixed with other ethnicities in various countries? (BTW, this is not intended to be a racist question)
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