In a famous experiment, matthew meselson and franklin stahl grew e. coli cells in a medium containing only the "heavy" isotope of nitrogen, 15 n n15 . these cells were then transferred to a medium with the "light" isotope of nitrogen, 14 n n14 . the results of the experiment supported the hypothesis of semiconservative replication, which was proposed by watson and crick. heavy dna ( 15 n n15 dna), hybrid dna, and light dna ( 14 n n14 dna) can be separated by centrifugation. if cells containing 15 n n15 dna are transferred to a medium with only 14 n n14 nh 4 cl nh4cl as a nitrogen source, what percent of daughter molecules are composed of hybrid dna after 2 2 generations? daughter molecules: % % predict what percent of daughter molecules would be composed of hybrid dna if dna exhibited conservative replication. that is, if a daughter dna molecule were composed of newly synthesized dna only. daughter molecules: