Neurospora crassa and the One Gene - One Enzyme Theory

Neurospora crassa is an ascomycete, the red bread mold. Like all fungi, it reproduces by spores.
It produces two kinds of spores:

* Conidia are spores produced by asexual reproduction. Mitosis of the haploid nuclei of the active, growing fungus generates the conidia.
* Ascospores, on the other hand, are formed following sexual reproduction. If two different mating types ("sexes") are allowed to grow together, they will fuse to form a diploid zygote. Meiosis of this zygote then gives rise to the haploid ascospores.

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