The purpose of these x-rays was to cause damage to DNA.
Beadle and Tatum exposed Neurospora spores to radiation like x-ray and UV to make new mutations. Beadle and Tatum also used the fungus Neurospora crassa a bread mould for their studies.
They knew that Neurospora was prototrophic therefore it is used as a model organism because it is easy to grow and has a haploid life cycle that makes genetic analysis simple since recessive traits will show up in the offspring. because of its variably it is an attractive alternative to drosophila for Mendelian genetic studies.
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