The correct option is (2): a bacterium The correct answer is a bacterium. This refers specifically to the development of Bt cotton, one of the most commercially successful transgenic crops. The insect resistance is achieved by inserting a specific gene, known as the cry gene (crystal protein gene), which is sourced from the soil bacterium Bacillus thuringiensis (Bt). This cry gene codes for a protein called the Cry toxin, which…Read More