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During cellular division, each cell gets a particular copy of the genetic information of the cell. Thus the process of copying the DNA is known as DNA replication.

RNA synthesis is typically initiated only at the specific site of the DNA template. In contrast to replication, the chromosomes are entirely copied.

Gene is a relatively loose term that refers to sequences that encode a polypeptide and cross-pond to the sequence of rRNA and other RNA.

A gene typically includes sequences that participate in initiating and terminating that are not transcribed. The expression of many genes also depends on the regular sequence that does not directly flank the coding region but may be located a considerable distance away.

Thus a single gene can quickly give rise to many copies of its gene products (RNA and Proteins)