They shouldn't be prohibited because they can help save lives. For instance, if someone has hereditary cancer, they should be able to genetically modify that person, so they and/or their children won't have cancer. this technology could potentially save lives, so I don't think that it should be prohibited.
I agree I don't think that it is fair that the Jew get the land because they had a really really sad story (even though it is really really terrible). The UN should have thought of something else to make it sound a little more reasonable.
I think that the two countries should be one, with two states inside of it. They could have Jerusalem as their shared capital, and have capitals of their own. This way, they could have two different governments in each state, and different laws in each, similar to the U.S. They could both have the same currency and regulations, so it would be easier to go to one place to another. They could also have one big governing body that controls the entire country.