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I'd asked Rabbi Hershel Welcher of Queens a similar question, about goats that were given a bit of spider genes so they would produce gossamer in their milk. He felt the concept of "zeh v'zeh gorem, mutar" applied -- as the spider genes would not have sufficed to produce an organism, such a goat is kosher. So the same should apply here.


Kosher speciation Generally speaking, we have a rule that "kol hayotzei min hatahor tahor, vichol hayotzei min hatamei tamei" ("that which comes from a kosher species is kosher, and that which comes from a non-kosher species is non-kosher"; see Bekhoroth 1:2). Since this new species comes from kosher and non-kosher species, there would be several potential ...


Rambam writes (Maachalos Asuros 10:11-12): ספק ערלה וכלאי הכרם בארץ ישראל אסור. בסוריא והיא ארצות שכבש דוד מותר. כיצד היה כרם וערלה וענבים נמכרות חוצה לו. היה ירק זרוע בתוכו וירק נמכר חוצה לו. שמא ממנו הוא זה שמא מאחר. בסוריא מותר ובחוצה לארץ אפילו ראה הענבים יוצאות מכרם ערלה או ירק יוצא מן הכרם לוקח מהן. והוא שלא יראה אותו בוצר מן הערלה או לוקט ...


The Chasam Sofer (Toras Moshe parshas Shemini) writes that the meaning of the Medrash (cited by many Rishonim) that the pig is called a חזיר because עתיד הקב"ה להחזירה לישראל - Hashem is going to "return" it to the Jewish people - is that the physiology of the pig will be altered to chew its cud (the Kosher sign that it currently does not have) and will ...

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