Zoology - Biotechnology and Its Applications Question with Solution | TestHub
Bt cotton variety that was developed by the introduction of toxin gene ofBacillus thuringiensis(Bt) is resistant toNEET 2020 (Phase 1)
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Bt toxin is produced byBacillus thuringiensishas been cloned in bacteria and been expressed in plants to provide resistance to insects without the need for insecticides in effect creating a biopesticide.Examples are Bt cotton, corn, rice, tomato, potato, soybean, etc. Specific Bt toxin genes were isolated fromBacillus thuringiensis and incorporated into several crop plants such as cotton. The choice of a gene depends on the crop and the pest as most Bt toxins are insect group-specific. This toxin is encoded by a gene named cry. These genes are effective against various types of insectse.g., Lepidopterans (tobacco budworm, armyworm), Coleopterans (beetles), and dipterans (flies and mosquitoes). There are a number of such genes, for instance, the proteins encoded by genecryIAc and cryIIAb controls cotton bollworm that of cryIAb corn borer.
