Cell cycle and mitosis

BiologyCell BiologyAges 15–16

The cell cycle ring runs G1 → S → G2 → M with a phase hand, three checkpoints, and a DNA-content graph; alongside it, an animated cell shows chromosomes duplicating in S phase, condensing in prophase, lining up in metaphase, separating to opposite poles in anaphase, and forming two daughter cells in telophase. Students choose the diploid chromosome number 2n and the speed, and can tap the ring to jump to a phase or pause it at a checkpoint.