Chromosome

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 727.0 Hz, 131 cents flat of G5, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it to pull its two halves apart.

A chromosome is a long thread of DNA, wound up tight and packed small. Most human cells have 46 of them, in 23 pairs. Before a cell divides, each chromosome copies itself, and the two copies, called sister chromatids, stay joined at a pinched spot, the centromere, making an X shape.

Tap it to watch them part, as they do when a cell divides: thin fibers reach in from two bright poles, hook on at the middle and pull the two halves apart to either side, arms trailing. Then the splash puts them back together. This way each new cell gets a full set.

This link opens it in the Playground. To put it on your own page, add the element and one script tag. Every option.