The significance of genetics in biology today stems to a considerable
extent from the knowledge which has been obtained through the use of
fungi as experimental objects. As a result of their short generation
time, their ease of culture under laboratory conditions, and the
possibil- ity of identifying the four products of meiosis through tetrad
analysis, the fungi have proven themselves in many ways superior to the
classic genetic experimental material such as Drosophila and maize.
Because they permit investigation of genetic fine structure as well as
biochemical analysis of the function of the genetic material, the fungi
can be used, just as the bacteria and bacteriophages, for molecular
biological research. Further, the fungi, because of their simple organi-
zation, are suitable for investigation of the genetic and physiological
bases of morphogenesis and of extrachromosomal inheritance. This
monograph is an attempt to summarize and interpret the results of
genetic research on fungi. The reader should be reminded that review and
interpretation of original research are inevitably influenced by the
authors' own opinions. An understanding of the basic principles of
genetics is assumed.