Question

Insect resistance transgenic cotton has been produced by inserting a piece of DNA from

• A. An insect
• B. A bacterium
• C. A wild relative of cotton
• D. A virus

Answer 1

Answer: (B)

A bacterium

Bt cotton is a genetically modified variety of cotton producing an insecticide. The bacterium Bacillus thuringiensis (Bt) naturally produces chemicals harmful to selective insects, most notably the larvae of moths and butterflies, beetles, cotton bollworms and flies, and harmless to other forms of life. The gene coding for Bt toxin i.e., CRY gene has been inserted into the cotton plant with the help of DNA of bacteria, causing cotton to produce this natural insecticide in its tissues. The bacteria that used as a vector is Agrobacterium tumefaciens.

So, the correct answer is 'A bacterium'