DNA replication is semi-conservative, and the culture was grown in light media for 1 generation. 2. DNA replication is conservative, and the culture was grown in light media for 1 generation. 3. DNA replication is semi-conservative, and the culture was grown in light media for 2 generations. 4. DNA replication is conservative, and the culture was grown in light media for 2 generations. 5. DNA replication is dispersive, and the culture was grown in light media for 1 generation. 6. DNA replication is semi-conservative, and the culture was grown in light media for 1 generation, then shifted back to heavy media for 1 more generation. 7. Which tube represents the position expected if the bacteria were never shifted to light media at all?