Gene expression is carried through:
(1) DNA Replication and subsequent
The gene products are often proteins.
Functional RNA ( rRNA, and tRNA, siRNA. ) is also a gene product which is a non-protein
The formation of the gene product gives the gene control over structure and function.
It is the basis for cellular differentiation, morphogenesis, versatility and adaptability.
The gene products define the transmission of hereditary characteristics
References
1. Gene Expression:http://en.wikipedia.org/wiki/Gene_expression.
2. Gene Regulation:http://www.nature.com/scitable/topic/gene-expression-and-regulation-15