Read a book in the 1980’s that warns of the dangers of genetic engineering. My memory is very vague as to details, but I seem to recall the book opening with modified grass or rice seeds that proliferate in the S.F. Bay area, causing problems. Later, parents can choose to alter their fetus' genetics, eliminating such things as diseases and alcoholism, as a well as increasing intelligence. Still later in the book, these children can spontaneously suicide.