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Define a cistron. Giving examples differ...

Define a cistron. Giving examples differentiate between monocistronic and polycistronic unit.

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A cistron is stretch of base sequences that codes for one polypeptide chain including adjacent control regions. It may also code for a tRNA, rRNA molecule or may perform other specific functions including regulating functions of other cistrons.
This term has replaced the definition of a gene . Monocistronic transcription unit will have all the regulatory and coding sequences for a single polypeptide, Whereas polycistronic may have coding sequenes for more then one polypeptide.
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