A) cry \[\text{ }\!\!|\!\!\text{ Ac}\]
B) cry \[\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ Ab}\]
C) cryl\[\text{ }\!\!|\!\!\text{ Ab}\]
D) \[\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ Ac}\]
Correct Answer: C
Solution :
Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton to provide resistance to insects. The toxin is coded by a gene named \[cry.\] There are a number of them, for example, the proteins encoded by the genes cry LAC and \[cry\,II\] Ab control the cotton bollworms, that of cry \[IAb\] controls corn borer. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific.
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