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Transgenic Animals

Transgenic cr...

Question

Transgenic crops are modified through genetic engineering to develop natural resistance to insect pests. Which of the following are transgenic plants?

A

Tobacco and cotton

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B

Tomato and rice

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C

Maize and sugarcane

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D

Tomato and wheat

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Solution

The correct option is A Tobacco and cotton
Insect resistant transgenic plants contain either a gene from the bacterium Bacillus thuringiensis or some other hybrid gene. In Bt cotton the insect resistant gene is transferred from Bacillus thuringiensis. In tobacco, the gene silencing method is applied using RNAi. A gene is added into the genome of tobacco that creates complimentary RNA for the mRNA of nematodes, the parasite of tobacco plants. Both these methods confer pest resistance to these plants making them prime examples of transgenic plants.

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Q. Assertion :The plants in which foreign genes have been introduced through genetic engineering are called transgenic plants. Reason: Transgenic animals have been extensively used as models for biomedical research.

Q. Pick the incorrect statements among the following:
(i) Bt brinjal is the first transgenic crop commercially available in India.
(ii) Genetically modified plants are produced by modifying the DNA of a plant, thus giving it new characteristics.
(iii) Bt cotton, Bt brinjal, golden rice are some examples of transgenic crops.
(iv) A toxin gene from Bacillus thuringiensis bacteria was transferred to cotton plant.
(v) Transgenic plants increased efficiency of mineral usage by plants.

Q. Transgenic plants of tomato having resistance to hornworm larvae are those which have

Q. Statement 1: Bt Cotton is a transgenic crop which is resistant to pests.
Statement 2: The gene responsible for providing pest resistance to this GM crop is
obtained from the bacteria Agrobacterium tumefaciens.

Q. Which of the following are some ethical issues associated with biotechnology?
1. Animals used for safety testing of drugs and vaccines suffer from great pain and discomfort.
2. Transgenic organisms used in research may have a negative impact on the wild population, if they are accidentally released.
3. Almost all the bacteria used in genetic engineering are pathogenic.
4. Herbicide resistance genes introduced into crops may be passed on to weeds.

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