Musician/actor Lenny Kravitz is half Jewish, half black. He was brought up without religion, so we marked him "Borderline Jew" (although recent dabbles into Christianity probably should move him closer to "Barely a Jew").
Actress Lisa Bonet is half Jewish, half black. It is not clear if she practices any religion, or identifies as Jewish, so we marked her as "Borderline Jew". It's a very handy spot in our verdict matrix.
Lenny and Lisa's daughter, actress/model Zoe Kravitz is... well, half Jewish, half black! And, guess what, she self-identifies as Jewish, so the verdict is... "Jew"!
Borderline Jew father + Borderline Jew mother = Jew daughter?
It doesn't have to add up!