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

The Genetic Code

Index to this page

The genetic code consists of 64 triplets of nucleotides. These triplets are called codons.With three exceptions, each codon encodes for one of the 20 amino acids used in the synthesis of proteins. That produces some redundancy in the code: most of the amino acids being encoded by more than one codon.

One codon, AUG serves two related functions:

  • it signals the