A DNA molecule containing radioactive thymidi | vedclass

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(B) $DNA$ replication is semi-conservative. In the first replication cycle,the original $DNA$ molecule (with radioactive strands) produces two $DNA$ m

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(B) $DNA$ replication is semi-conservative. In the first replication cycle,the original $DNA$ molecule (with radioactive strands) produces two $DNA$ molecules,each having one radioactive strand and one non-radioactive strand. In the second replication cycle,these two $DNA$ molecules produce four $DNA$ molecules. Out of these,two will contain one radioactive strand each,and two will be completely non-radioactive. In the third replication cycle,the two $DNA$ molecules that contain radioactive strands will produce two $DNA$ molecules each (total four),but only one strand in each of these four molecules will be radioactive. Therefore,after three cycles,the number of $DNA$ molecules containing radioactive thymidine remains $2$.

$A$ $DNA$ molecule containing radioactive thymidine is allowed to replicate in a non-radioactive environment. What will be the exact number of $DNA$ molecules containing radioactive thymidine after three replication cycles?

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