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cryII Ab and cry I Ab produce toxins tha...

cryII Ab and cry I Ab produce toxins that control:

A

cotton bollworms and corn borer respectively

B

corn borer and cotton bollworm respectively

C

cotton borer and corn bollworms respectively

D

corn borer and tobacco budworms respectively.

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The correct Answer is:
A
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The protein products of the following Bt toxin genes cryIAc and cryIIAb are responsible for controlling:

Bt toxin is produced by a bacterium called Bacillus thuringiensis ( Bt for short). These Bt toxin crystals contain by a gene named cry which has many variants. Which one from the following produces a toxin that controls corn borer ?

Gene cry IAb controls

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. What is true about Bt cotton crops?

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