Question: In Beadle and Tatum’s study of Neurospora, they were able to identify three classes of mutants th…

In Beadle and Tatum’s study of Neurospora, they were
able to identify three classes of mutants that needed arginine
added to minimal media in order to grow. The production of arginine
includes the following steps:

precursor ——> ornithine ——-> citrulline
——–> arginine

a. What nutrient(s) had to be supplied for the mutants with a
defective enzyme for the precursor ——-> citrulline step to
grow (please look carefully at this experiment to answer)?

b. What hypothesis does this work support?

c. Does one gene always code for
one protein?

d. What other “gene products” can
a gene code for (list all possibilities)?