Abstract: It is an object of the present invention to provide fungal host organisms capable of expressing recombinant proteins while at the same time exhibiting satisfactory growth characteristics. It is a further object to provide—in a single fungal host organism—the characteristic of homogeneous growth and low viscosity typically associated with yeast organisms, and the capability for high protein secretion normally associated with filamentous fungi. It is a yet further object of the invention to provide useful tools for genetic analysis in zygomycetes, including dimorphic zygomycetes. Accordingly, the present invention relates to a recombinant, fungal cell or dimorphic fungal cell comprising a regulatable expression of a regulator of morphology. The nucleotide sequence encoding the at least one regulator of morphology is operably linked to an expression signal not natively associated therewith.