Cellular oncogenes (c-onc) or proto-oncogenes have been identified in normal cells. Which when activated under
certain conditions, could lead to oncogenic transformation of the cells.
Cancer causing virus called oncogenic virus have genes called viral oncogenes.
Inducer gene: $A$ molecule that regulate gene expression.
Jumping genes: Genes that can change their position within the genome.
Structural gene: Genes that codes for any $RNA$ or protein product other than a regulatory protein.