The discovery that a gene can be divided into hundreds of components, each of which is capable of mutation, is attributed to Seymour Benzer. This was concluded using:
1
Lysis mutants of bacteriophage T4
2
White eye Mutants of Drosophila melanogaster
3
Biochemical mutants of Neurospora crassa.
4
Auxotrophic mutants of Escherichia coli.