In Meselson and Stahl experiment, E.coli which were incubated in ¹⁵NH₄Cl, transferred to ¹⁴NH₄Cl containing medium and allowed for two generations of binary fission. When DNA of these bacteria was isolated and subjected to CsCl density gradient centrifugation, the result was

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Half of the DNA was heavy and another half light DNA

Half of the DNA was hybrid and another half light DNA

All the DNA was hybrid DNA

All the DNA was light DNA

answer is B.

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Detailed Solution

Half of the DNA was hybrid as such DNA has one heavy strand and one light strand another half has both strands as light strand DNA.

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