One of the most basic concepts of biological science is that multicellular organisms develop from a single-cell zygote into a creature with a unique genome. The only exceptions to this rule have been chimeras, which are generally considered accidents of nature. In this new effort, the research team found another exception?"male yellow crazy ants with dual sets of DNA. Prior research had shown anomalies in crazy yellow ant genetics, but until now, it was not clear what was behind apparent discrepancies between queens, males and worker ants. To clear up the mystery, the researchers conducted population genetic and phylogeographic studies of specimens collected from sites across Asia.