The synaptonemal complex aligns meiotic chromosomes by wetting.

Summary: Imagine trying to zip up a jacket where the teeth represent your DNA. For life to continue, chromosomes from parents must line up perfectly to swap genetic information. Scientists have discovered that this alignment isn't just mechanical—it's fluid. The "zipper" (called the synaptonemal complex) acts like a liquid, using a physics process called "wetting" to pull the chromosome backbones together. Just as water spreads to cover a surface, this protein complex flows to ensure our genetic blueprint aligns flawlessly during reproduction.