Q19 of 805 Page 1

Name the organism from which the ‘cry’ genes are isolated. Mention with the help of suitable example why and how bio-technologists have made use of ‘cry’ genes.

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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