Bichromosomal Synthetic Semilethals in Drosophila Pseudoobscura Dobzhansky, Theodosius ; Spassky, Boris ; Anderson, Wyatt Abstract Publication: Proceedings of the National Academy of Science Pub Date: March 1965 DOI: 10.1073/pnas.53.3.482 Bibcode: 1965PNAS...53..482D