Question

To increase wool production and to improve the quality of wool, the bacterial genes concerned with biosynthesis of cysteine amino acids involved in formation of keratin protein found in wool are cloned and introduced in sheep.

• A. cys E, cys M.
• B. cys F, cys G.
• C. cys F, cys M.
• D. lac y, lac a.

Hint:

Genetic modification using bacterial genes like \(cys E\) and \(cys M\) improves the quality of wool by enhancing keratin production.

Answer 1

The Correct Option is A

Step 1: Cysteine's role in wool production.
Cysteine, a sulfur-containing amino acid, is essential for disulfide bond formation in keratin, thereby improving wool strength and quality. Genetic modification targets genes involved in cysteine biosynthesis.

Step 2: Relevant bacterial genes.
The bacterial genes \(cys E\) and \(cys M\) are responsible for cysteine biosynthesis. These genes are cloned and introduced into sheep to enhance wool quality and production.

Step 3: Evaluation of other options.

Option (A): cys E, cys M. Correct. These genes are involved in cysteine biosynthesis.

Option (B): cys F, cys G. Incorrect. These genes are not involved in cysteine biosynthesis.

Option (C): cys F, cys M. Incorrect. Only \(cys M\) is relevant; \(cys F\) is not involved.

Option (D): lac y, lac a. Incorrect. These genes are related to lactose metabolism and are irrelevant to wool production.

Step 4: Conclusion.
The genes \(cys E\) and \(cys M\) are crucial for improving wool quality. \[ \therefore \text{The correct answer is: (A)}. \]