Genetically Modified Organisms

by Rabbi Benjy Simons 

A customer asks the shopkeeper, ‘Are these strawberries genetically modified’? 

The shopkeeper responds, ‘of course not’. 

The strawberries say, ‘oh yes we are’. 

In this week’s Parsha we are commanded against crossbreeding across different species, such as interbreeding livestock or mixing seeds (Kilayim) or certain clothing fibres (Shatnez). Rashi explains that these are super-rational laws which cannot be understood, though other commentators try to give partial reasons for avoiding these mixtures. The Ibn Ezra suggests that we are commanded to not alter the work of G-d and thus we are commanded to preserve the species and not interbreed them. The Ramban echoes this idea in that one who grafts two species undermines the work of creation, as if to say that Hashem did not complete the needs of this world and that we can further perfect what G-d already created. 

Yet at the same time we find the Midrash (Bereishis Rabbah 11:6) mentions that everything Hashem created during the six days of creation require further processing to bring them to their ultimate state, such as mustard seeds which require sweetening or wheat requiring grinding. Similarly, we find in the Talmud (Pesachim 54a) that Adam after the first Shabbos created fire and mated a donkey and horse to produce a mule, symbolic of man’s creative abilities in enhancing creation. 

The above concepts are often a starting point for the important discussion of Genetically Modified Organisms (GMO’s) which refers to an organism that has had its DNA altered or modified through genetic engineering. The OU has given its stamp of approval to salmon that were genetically altered with the DNA of eels (which are non-kosher) to enable them to grow twice as fast as they still contain fins and scales. In 2012 spider genes were added to goats, so their milk contained gossamer to produce silk and the goat milk was still deemed kosher. Rabbi Shlomo Zalman Auerbach permitted this is it didn’t fall under the category of crossbreeding which the Torah prohibits and the Aruch HaShulchan similarly allowed the idea, as since such actions can’t be seen by the naked eye, Halachically it is deemed insignificant. 

Could one genetically modify a pig to make it Halachically acceptable were it to chew its cud? 

The Mishna (Bechoros 1:2) mentions that the offspring of kosher animals are deemed kosher, even when they lack kosher signs. Similarly, the offspring of non-kosher animals are forbidden, even were they to exhibit kosher signs. This idea may even be extended to surrogacy in that the surrogate mother is considered the mother of the child in a Halachic sense, even when they are not connected to the biological material (see Targum Yonasan to Bereishis 30:21). Therefore, perhaps it is possible that if the foetus of a modified pig was to be placed into a kosher animal artificially, it would be deemed acceptable. As discussed previously, the concept of the pig becoming kosher will usher a return to Zion and the Messianic age. May our efforts in making this a reality bring us closer to that goal.