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Molecular Basis Of Inheritance

Question
CBSEENBI12002686
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Cry-I endotoxins obtained from Bacillus thringiensis are effective against 

  • mosquitoes

  • flies

  • nematodes

  • boll worms

Solution

B.

flies

Insect-resistant transgenic plants contain either a gene from the bacterium Bacillus thuringiensis or some other gene. The cry gene of bacillus thuringiensis produces a protein which forms crystalline inclusion in the bacterial strains. Cry-I endotoxins are effective gains Lepidoptera (eg flies). Cry- V and Cry-VI proteins are effective against are ingested by insects, they are dissolved in the alkaline juices present in the midgut lumen. The gut proteases process them hydrolytically to release the core toxic fragments. The toxic fragments are believed to bind to specific high-affinity receptors present in the brush border of midgut epithelial cells and causing their swelling and eventual lysis.

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