Regulation at Transcription Level
As in prokaryotes, regulation of gene expression is exercised in majority of cases at the level of transcription, although examples of post-transcriptional control are also known. In view of this, major part of this section is devoted to regulation at transcriptional level. This regulation may involve both activation and repression, because genes may have to be switched on in some cases and switched off in other cases. DNA sequences involved in regulation, were also identified through the use of DNA footprinting as well as through the use of gene constructs for production of transgenic plants. All these aspects will be briefly described in this section.