Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q130 (IAS/1999) Science & Technology › Biotechnology & Health › Cloning and reproductive technologies Answer Verified

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

Result
Your answer: —  Â·  Correct: C
Explanation

Assertion (A) is essentially true in the intended exam sense: Dolly was the landmark cloned sheep—famously the first mammal cloned from a differentiated adult somatic cell and announced in 1997, marking a major breakthrough in reproductive cloning [3]. Reason (R) is false: Dolly was not produced by in vitro fertilization. Instead, Roslin scientists used somatic cell nuclear transfer (SCNT), transferring the nucleus from an adult mammary-cell donor into an enucleated egg, stimulating it to divide and implanting the resulting embryo into a surrogate mother [3]. Thus A is true (in context) but R incorrectly attributes the method to IVF rather than SCNT [2].

Sources

  1. [2] https://hms.harvard.edu/news/improving-cloning-efficiency
  2. [3] https://www.nms.ac.uk/discover-catalogue/the-story-of-dolly-the-sheep
  3. [1] https://ourhistory.is.ed.ac.uk/index.php/Cloning_of_Dolly_the_Sheep%2C_1996
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
75%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

IAS · 2005 · Q34 Relevance score: -0.59

Assertion (A) : Amoeba is reproduced by fission. Reason (R) : All unicellular organisms are reproduced by asexual methods.

IAS · 1994 · Q116 Relevance score: -1.42

Assertion (A) : A lock of Einstein’s hair, if scientists could locate it and extract its DNA, could help in producing another Einstein, by cloning. Reason (R) : The DNA extracted from the cell of an embryo at an early stage of development, can be transferred to individual eggs which in turn can be implanted into the uterus of a surrogate mother to give birth to an identical off spring. In the context of the above two statements, which one of the following is correct ?

CDS-I · 2005 · Q105 Relevance score: -1.81

Assertion (A) : The mammals we see around do not hibernate. Reason (R) : Unlike other kinds of animals, mammals feed their young ones with milk.

IAS · 2004 · Q38 Relevance score: -2.04

Consider the following statements: 1. Adam Osborne produced the first portable computer. 2. Ian Wilmut created the first cloned sheep. Which of the statements given above is/ are correct?