UPSC Prelims PYQ 1999: Dolly the sheep — cloning method (Assertion‑Reason)

Consider the following statements:

1. Assertion (A): Dolly was the first cloned mammal.
2. Reason (R): Dolly was produced by in vitro fertilization.

Options:

1. Both A and R are true, and R is the correct explanation of A
2. Both A and R are true, but R is not a correct explanation of A
3. A is true, but R is false
4. A is false, but R is true

Explanation

Option (c) is correct

• Dolly the sheep was the world’s first cloned mammal, created in 1996. However, Dolly was not produced through in vitro fertilization. She was created using the technique of somatic cell nuclear transfer (SCNT), in which the nucleus of an adult cell was transferred into an enucleated egg cell.

Answer: (c) A is true, but R is false