The lineage of agriculture is a lineage of humans rearranging plant DNA. For a very long time, crossbreeding was the preferred method, but then came Mendel and his peas. As we began to understand how genetics worked, scientists tried all kinds of wild techniques to induce mutations. We dipped seeds in carcinogens and bombarded them with radiation, occasionally inside of nuclear reactors. There are over 2,250 of these mutants around; most of them are certified.