The smallest unit of genetic material which upon mutation produce a phenotypic effect is

A gene carries several cistrons which are defined as a unit of function that exhibits cis-trans test. The smallest unit capable of undergoing recombination is called as recon. A recon consists of one to several mutons, which are the smallest unit of mutation. The inducer is a molecule that binds to the repressor and causes conformational changes in repressor which in turn can no longer bind to the operator. Regulator gene regulates the expression of structural genes by its protein products that are mostly transcription factors. These transcription factors bind to the operator region which is located just upstream the binding site of the RNA polymerase and hence, prevent the binding and transcription.