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When was the first transgenic animal produced?

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When was the first transgenic animal produced?

(a) 1981

(b) 1971

(c) 1978

(d) 1986

This question was posed to me during an interview.

This interesting question is from Genetic Manipulation of Animal Cells in section Recombinant DNA Technology of Life Sciences

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Correct answer is (a) 1981

Easiest explanation: Ralph Brinster and Richard Palmiter in 1981 produced a first transgenic animal. They had introduced the gene for rat growth hormone in the fertilized egg of mice.

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