Assertion (A): Dolly was the first cloned mammal. Reason (R): Dolly was produced by in vitro fertilization.
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UPSC Civil Services preparation
- ABoth A and R are true, and R is the correct explanation of A
- BBoth A and R are true, but R is not a correct explanation of A
- CA is true, but R is falseCorrect
- DA is false, but R is true
Explanation
Assertion A is true because Dolly the sheep, born in 1996, was indeed the first mammal to be successfully cloned from an adult somatic cell.
Reason R is false because Dolly was not produced by in vitro fertilization IVF. IVF involves the fusion of a sperm and an egg. Dolly was created through a process called Somatic Cell Nuclear Transfer SCNT. This involved transferring the nucleus from an adult mammary gland cell into an unfertilized egg cell that had its own nucleus removed. Since the egg was not fertilized by a sperm, the resulting offspring was a genetic clone of the donor sheep.
Therefore, Assertion A is correct but Reason R is incorrect.
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