Question

what are transgenic animals ? give an example .....​

Answer 1

Explanation:

Trangenic animals are the animals with the modified genome. A foreign gene is inserted into the genome of the animal to alter its DNA. This method is done to improve the genetic traits of the target animal.

Initially, the improvement of genetic traits was done by selective breeding methods. In this, the animals with desired genetic characteristics were mated to produce an individual with improved genetic characteristics. Since this technique was time-consuming and expensive, it was later replaced by recombinant DNA technology.

Transgenesis is the phenomenon in which a foreign gene with desired characteristics is introduced into the genome of the target animal. The foreign gene that is introduced is known as the transgene, and the animal whose genome is altered is known as transgenic. These genes are passed on to the successive generations.

The transgenic animals are genetically engineered and are also known as genetically modified organisms. The first genetically modified organism was engineered in the year 1980.

sheep, goats, pigs, cows, rabbits, rats, mice, fish, insects, parasites and even humans have previously been used in this modification process

Answer 2

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what are transgenic animals ? give an example .....

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Animals that have had their DNA manipulated to possess and express an extra (foreign) gene are called transgenic animals. Transgenic rats, rabbits, pigs and cows have been produced.

Uses of transgenic animals for humans are:

(i) To study gene regulation, their effect on the normal functions of the body and its development,

(ii) Study of genes, which are responsible for diseases in human and their treatment, e.g. cancer,

(iii) Useful biological products can be produced by introducing the portion of DNA, which codes for a particular product into transgenic animals.

(iv) Transgenic mice are developed to test the safety of vaccines before being used in human

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The organisms which contain functional foreign genes experimentally introduced into their genome by genetic engineering from another species are called transgenic animals.

Benefits of transgenic animals:

1. Study of normal physiology and development: Transgenic animals are useful to study gene regulation, their effect on the normal functioning of the body and its development.

2. Study of diseases: Transgenic models have been developed for many human diseases like cancer, cystic fibrosis, rheumatoid arthritis and Alzheimer’s disease.

3. Vaccine safety: Transgenic mice have been developed to test the safety of vaccines before they are being used on humans.

4. Chemical safety testing: Transgenic animals are made to carry genes which make them more sensitive to the toxic substances than non-transgenic animals. On exposure to the toxic substances, their effects can be studied in a lesser time