Rabbi Dov Lior, a senior authority on Jewish law in the Religious Zionism movement, asserted recently that a Jewish woman should never get pregnant using sperm donated by a non-Jewish man – even if it is the last option available.
According to Lior, a baby born through such an insemination will have the “negative genetic traits that characterize non-Jews.” Instead, he advised sterile couples to adopt. 
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I’m not sure I oppose this. I think every culture and ethnicity has a right to preserve itself.