How transgenic animals are helpful in the study of human diseases?

Explanation

Study of disease. Transgenic animals are designed to increase our understanding of:
(a) how the genes contribute to the development of diseases.
(b) To serve as models for human diseases such as cancer, cystic fibrosis, theumatoid arthritis and Alzheimer.s so that new treatments become possible.
Human genes are being introduced into the animals like mice and help in increasing our understanding of how genes contribute to the development of disease, so that investigation of new treatments for diseases is made possible.