I’m not liberal, I’m semi-conservative:
DNA replication

When you crack open a whole new field of science, there’s plenty of Nobels to go around for those with hustle, ingenuity and luck. After the paper in Nature, guys all over the world got to work on just exactly how such copying might take place. In 1956, Stent and Delbruck pointed out that DNA replication could occur in one of three possible ways. In the first pattern, known as conservative replication, each parent strand gives rise to a new daughter strand, and the two daughter strands pair up. You get an old DNA molecule and a new DNA molecule. In dispersive replication, the old DNA molecule is fragmented, the old strands serve as templates, and the molecule reassembled. You get new DNA molecules in which old material is interspersed with new material. This model seems a little silly today, but it’s easy to make fun when you’re looking through a retrospectoscope. In the third model, each strand serves as a template for a daughter strand, and each daughter strand remains paired to the parent strand. So you get a two DNA molecules, each of which has one new strand and one old strand. This is known as semi-conservative replication.