Question

(a) Name the gene used to develop Bt cotton.
(b) Where is the above gene obtained from?
(c) What converts the inactive Bt protoxin into its active form?
[3 marks]

Answer 1

a) 'cry' gene is used to develop Bt cotton. [1 mark]
b) cry gene is obtained from the bacterium Bacillus thuringiensis. [1 mark]
c) Once an insect ingests the inactive Bt protoxin, it is converted into its active form due to the alkaline pH of the gut of the insect. [1 mark]