Students dive deep into AP Biology Unit 4.6 Regulation of the Cell Cycle through a sequence of scaffolded diagrams, data models, and FRQ-style questions that reveal how cyclins, CDKs, and checkpoints coordinate cell division, and how a loss of regulation can lead to cancer. Each model reinforces how internal and external signals regulate progression through G₁, S, G₂, and M phases, while built-in writing prompts train students to identify, explain, and justify responses just like on the AP e