<prompt> Radio labelled DNA was allowed to replicate twice in a non-radioactive environment. Which of the following is true?All the strands will have radioactivityHalf of the DNA will have no radioactivityNo strands will have radioactivityThree-fourth of the DNA replicated will have radioactivity  <response>: Ans. B. Half of the DNA will have no radioactivityRef: Harper 31e page 363Semiconservative Nature of DNA Replication proved by Meselson and Stahl states that half of the parent strand is conserved during replication in the daughter strand.After one replication all the DNA will have radioactivity.After two replication half of the DNA will have radioactivity. 