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  • DNA having labeled thymidine is allowed to replicate in mediums having non-radioactive thymidine. After three duplication, the DNA molecules having labeled thymidine shall be  <d

DNA having labeled thymidine is allowed to replicate in mediums having non-radioactive thymidine. After three duplication, the DNA molecules having labeled thymidine shall be

 

Option: 1

One molecule


Option: 2

Two molecules


Option: 3

Four molecules

 


Option: 4

Eight molecules


Answers (1)

best_answer

DNA replication is semi-conservative in nature. When the parental strand has radioactive thymine, the daughter DNA molecule will have one strand with radioactive thymine whereas the other strand will have non-radioactive thymine.  Thus, when it again replicates, one set of daughter molecules will have radioactive thymine, but the other won't have it completely and so on. Thus, after 3 generations, we can get 2 molecules with radioactive thymine.Hence, the correct answer is option 2.

 

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rishi.raj

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