Gene expression can be controlled with the help of RNA molecule. Explain the method with an example.

Gene expression can be controlled by using RNA molecule. The technology is called RNA interference or RNAi. It is used to block the expression of certain genes and also referred to as gene silencing. During this process a complementary RNA to the mRNA being produced by the gene is introduced into the cell. This RNA binds to the mRNA making it double stranded and herefore stops translation. Resistance to nematode Meloidegyne incognita in tomato has been achieved by this method.