Advantages of Transgenesis:

1. Study of Diseases and Gene Therapy:
One of the major advantages of transgenesis is its role in the study of diseases and gene therapy. Transgenic animals, which are animals that have had foreign genes inserted into their genome, can be used to model human diseases. By introducing specific disease-causing genes or modifying existing genes, scientists can study the development and progression of various diseases, such as cancer, Alzheimer's, and Parkinson's disease. This allows for a better understanding of the underlying mechanisms of these diseases and the development of potential treatments and therapies.

Gene therapy, on the other hand, involves the introduction of therapeutic genes into an individual's cells to treat genetic disorders. Transgenic animals can be used to test the efficacy and safety of gene therapy techniques before they are applied to humans. This ensures that potential risks and adverse effects can be identified and addressed before human trials, improving the safety and success rates of gene therapy treatments.

2. Increased Production of Biological Products:
Transgenesis can also be used to increase the production of biological products. By introducing genes responsible for the production of specific proteins or compounds into animals or plants, scientists can create transgenic organisms that produce these products in large quantities. For example, transgenic cows can be engineered to produce human proteins, such as insulin or clotting factors, in their milk. This allows for the production of these valuable therapeutic proteins on a larger scale, making them more accessible and affordable for medical purposes.

3. Vaccine Safety Testing:
Transgenesis also plays a crucial role in vaccine safety testing. Transgenic animals can be created to express specific human genes involved in the immune response. These animals can then be used to test the safety and efficacy of vaccines by exposing them to pathogens or antigens. By studying the immune response in these transgenic animals, scientists can better understand how vaccines interact with the immune system and identify any potential side effects or adverse reactions.

In conclusion, transgenesis offers several advantages in the study of diseases and gene therapy, the increased production of biological products, and vaccine safety testing. These applications contribute to advancements in medical research, the development of new treatments, and the improvement of public health.

U can see class 12 biology NCERT text book... page 212-213... there is a very nice and short answer to ur question...