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By whose experiment evidence of the existence of conjugation was established?

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By whose experiment evidence of the existence of conjugation was established?

(a) Robert Hook

(b) Albert Einstein

(c) Thomas Bill and Jimmy Bill

(d) Joshua Lederberg and Edward Tatum

This question was posed to me in semester exam.

Query is from Genetic Recombination topic in chapter Genetic Recombination of Drug Biotechnology

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Right option is (d) Joshua Lederberg and Edward Tatum

For explanation I would say: The evidence for conjugation was discovered by the experiment of Joshua Lederberg and Edward Tatum in the year 1946. They found out genetic material can be transferred by direct cell to cell contact.

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