Enlist different cry genes of B.thuringiensis and their target insects.

Assertion : Plants having gene from Bacilus thuringiensis are resistant to insects Reason : Theso transgenic plants have receptors which convert protoxin into active toxin.

What do 'cry' genes in Bacillus thuringiensis code for ? State its importance for cotton crop.

Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. Some strains of Bacillus thuringiensis can kill certain insects such as

Why do toxic insecticide protein secreted by Bacillus thuringiensis kill insects?

Enlist different desired traits of the parents chosen for selective breeding.

Assertion A crop expressing a cry gene is usually resistant to a group of insects. Reason Cry protein produced from Bacillus thuringiensis is toxic to larvae of certain insects.

Insect tolerant gene from Bacilus thuringiensis is introduced using Ti plasmid of

Insect tolerant gene from Bacillus thuringiensis is introduced using Ti plasmid of