Which specific cry genes isolated from Bacillus thuringiensis have been introduced into genetically modified cotton to control the cotton bollworm pest?
Answer and explanation
Correct answer: B. cryIAc and cryIIAb
- Step 1: Different Cry proteins exhibit distinct target insect specificity.
- Step 2: In NCERT biology, cryIAc and cryIIAb encode toxins that selectively kill lepidopteran cotton bollworms (Helicoverpa armigera).
- Step 3: In contrast, the cryIAb gene is used in transgenic corn to control the European corn borer (Ostrinia nubilalis).
Answer
cryIAc and cryIIAb.
Why not the others: cryIAb controls corn borer, not cotton bollworms; cryIIIA controls coleopteran beetles; cryIVD targets dipteran mosquitoes.
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