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(D) Animals whose $DNA$ is manipulated to possess and express an extra (foreign) gene are known as transgenic animals. The common reasons for developi

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$I, II, III, IV$ and $V$

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(D) Animals whose $DNA$ is manipulated to possess and express an extra (foreign) gene are known as transgenic animals. The common reasons for developing transgenic animals include:$(i)$ Study of normal physiology and development: Transgenic animals are used to study how genes are regulated and how they affect the normal functions of the body and its development, e.g., study of complex growth factors like insulin-like growth factor.$(ii)$ Study of diseases: Transgenic models have been developed for many human diseases such as cancer, cystic fibrosis, rheumatoid arthritis, and Alzheimer's disease to understand the disease mechanism.$(iii)$ Obtaining useful biological products: Transgenic animals can be used to produce biological products, e.g., human protein ($\alpha-1$-antitrypsin) is used to treat emphysema.$(iv)$ Vaccine safety: Transgenic mice are developed to test the safety of vaccines before they are used on humans, e.g., the polio vaccine.$(v)$ Chemical safety testing: Transgenic animals are designed to carry genes that make them more sensitive to toxic substances than non-transgenic animals, allowing for faster toxicity testing.Since all the statements ($I, II, III, IV,$ and $V$) are correct, the correct option is $D$.

Transgenic animals are produced for which of the following purposes?
$I$. To study the normal physiology and development
$II$. To study diseases
$III$. To obtain useful biological products
$IV$. To test the vaccine safety
$V$. To test the chemical safety
Which of the above statements are correct?

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Transgenic animals are produced for which of the following purposes?$I$. To study the normal physiology and development$II$. To study diseases$III$. To obtain useful biological products$IV$. To test the vaccine safety$V$. To test the chemical safetyWhich of the above statements are correct?