A bacterium containing fully radioactive DNA | vedclass

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(B) $DNA$ replication is semi-conservative.In the first generation,the two strands of the original radioactive $DNA$ separate,and each acts as a templ

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(B) $DNA$ replication is semi-conservative.In the first generation,the two strands of the original radioactive $DNA$ separate,and each acts as a template for a new non-radioactive strand. This results in two hybrid $DNA$ molecules (one radioactive strand and one non-radioactive strand).In the second generation,these two hybrid $DNA$ molecules replicate. The two radioactive strands will each produce a non-radioactive partner,resulting in two hybrid $DNA$ molecules. The two non-radioactive strands will each produce a non-radioactive partner,resulting in two purely non-radioactive $DNA$ molecules.Total $DNA$ molecules after two generations = $4$.Number of $DNA$ molecules containing radioactive strands = $2$.Percentage of bacteria containing radioactive $DNA$ = $(2/4) 	imes 100 = 50\%$.

$A$ bacterium containing fully radioactive $DNA$ is allowed to replicate in a non-radioactive medium for two generations. What percentage of bacteria should contain radioactive $DNA$ (in $\%$)?

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