23
Question
Identify the gene of Bacillus thuringiensis that produces a toxin effective against the pest called corn borer.
Identify the gene of Bacillus thuringiensis that produces a toxin effective against the pest called corn borer.
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Solution
The correct option is A cryⅠAb
Bt-toxin (Cry-toxin) is coded by the bacterium Bacillus thuringiensis "cry gene". There are many different types of "cry genes" coding for many "Cry proteins" which are effective against many different insect groups.
Classification of different "Cry genes" are based on their amino acid sequences:
- Number indicates less than 40% identity
- Capital letter indicates less than 70% identity
- Small letter indicates more than 70% but less than 95% identity
The genes cryⅠAc and cryⅡAb work against cotton bollworms whereas cryⅠAb works against corn borer.
Bt-toxin (Cry-toxin) is coded by the bacterium Bacillus thuringiensis "cry gene". There are many different types of "cry genes" coding for many "Cry proteins" which are effective against many different insect groups.
Classification of different "Cry genes" are based on their amino acid sequences:
- Number indicates less than 40% identity
- Capital letter indicates less than 70% identity
- Small letter indicates more than 70% but less than 95% identity
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