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The cry II Ab and cry I Ab produce toxi...

The cry II Ab and cry I Ab produce toxins that control

A

cotton bollworm and corn borers respectively

B

corn borers and cotton bollworms respectively

C

tobacco budworms and nematodes respectively

D

nematodes and tobacco budworms respectively

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Genes and Their Sources:** - The genes mentioned are cry II Ab and cry I Ab. These genes are derived from a bacterium known as *Bacillus thuringiensis* (Bt). 2. **Understand the Function of These Genes:** - The cry genes produce specific proteins that function as toxins. These proteins are toxic to certain insects when ingested. 3. **Determine the Target Pests:** - The cry II Ab gene specifically targets cotton ballworms, while the cry I Ab gene targets corn borers. 4. **Mechanism of Action:** - When insects consume plants that express these cry genes, the toxins produced by the genes disrupt the digestive system of the insects, leading to their death. 5. **Application in Agriculture:** - These genes are incorporated into genetically modified crops to provide resistance against these pests, reducing the need for chemical pesticides. 6. **Clarify Other Pests Mentioned:** - The transcript also mentions tobacco budworms and nematodes, which are controlled by different methods, such as RNA silencing, rather than the cry genes. 7. **Summarize the Findings:** - In conclusion, cry II Ab and cry I Ab produce toxins that control cotton ballworms and corn borers, respectively.
**Step-by-Step Solution:** 1. **Identify the Genes and Their Sources:** - The genes mentioned are cry II Ab and cry I Ab. These genes are derived from a bacterium known as *Bacillus thuringiensis* (Bt). 2. **Understand the Function of These Genes:** - The cry genes produce specific proteins that function as toxins. These proteins are toxic to certain insects when ingested. ...
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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 ?

Assertion: The choice of cry-gene depends upon the crop & the targeted pest Reason :Gene cry Iac & cry II Ab control the cotton bollworms while cry Iab 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?