Mobile Genes Found to Pressure Species Formation. Biologists at the University of Rochester have discovered that an old and relatively unpopular theory about how a single species can split in two turns out to be accurate after all, and acting in nature.The finding, reported in today's issue of Science, reveals that scientists must reassess the processes involved in the origin of species. The beginnings of speciation, suggests the paper, can be triggered by genes that change their locations in a genome. "In the 1930s there was speculation that parts of chromosomes that switch from one location to another might cause...