Transposons can be used during which one of the following ?
Gene silencing
Autoradiography
Gene sequencing
Polymerase Chain Reaction
Option 1 is correct because the source of complementary RNA for RNAi (RNA interference) or gene silencing could be transposons (mobile genetic elements).
Option 2 is incorrect as autoradiography usually follows hybridization
Option 3 is incorrect as transposons are not required in gene sequencing.
Option 4 is also incorrect as PCR (polymerase Chain Reaction) is a process to make copies of DNA and does not need transposons.
Hence, the correct option is (1).