The central dogma of molecular genetics states that the genetic information flows :
Amino acids Proteins
DNA
DNA Carbohydrates
Proteins
DNA RNA
Proteins
DNA RNA
Carbohydrates
The molecular path of the flow of genetic information is explained by central dogma. Accordingly, the flow of genetic information is unidirectional and involves four processes. Replication of DNA copies the genetic information present in it which is transcribed into RNA by RNA polymerase enzyme. The RNA sequence of ribonucleotides is translated into an amino acid sequence of polypeptides by the process of translation. Thus the flow of genetic information is unidirectional and follows the path: DNA-->RNA-->protein.