Answer :

The ‘cry’ genes are isolated from a gram-positive bacterium called Bacillus thuringiensis.

Bio-technologists have made use of the ‘cry’ genes as:

i) The crystal proteins of Bacillus thuringiensis are used as a source of insecticide production as they can be used to control bollworms.

ii) Bt cotton, which is an insect-resistant variety of cotton are produced by introducing cry genes.

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