DNA replication is:

**The reasoning** DNA replication is **semi-conservative** because each new DNA molecule contains one original (old) strand and one newly synthesized strand. Think of it like this: the double helix unzips down the middle. Each separated strand then serves as a template to build its complementary partner. So from one DNA molecule, you get two identical copies — but each copy is half-old, half-new. This was brilliantly proven by the Meselson-Stahl experiment in 1958 using heavy nitrogen isotopes to track which strands were original. **Why the wrong options tempt you** - **Conservative** sounds logical but would mean the original DNA stays completely intact while an entirely new copy forms separately (doesn't happen). - **Dispersive** suggests DNA breaks into fragments with old and new bits randomly mixed throughout both strands (too messy and inaccurate). - **Random** implies no organized pattern at all (chaos wouldn't preserve genetic information!). **Quick takeaway** Remember: **"Semi" = half** — each daughter DNA is half-parent, half-child, like inheriting one eye color from each parent. That's semi-conservative replication!