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Q.

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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a

Half of the DNA was heavy and another half light DNA

b

Half of the DNA was hybrid and another half light DNA

c

All the DNA was hybrid DNA

d

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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