Unit 7: Natural Selection

Key Concepts:

• Cell cycle phases (G₁, S, G₂, M) and checkpoints

• Regulation of the cell cycle (cyclins and CDKs)

• Mitosis vs. meiosis: stages and outcomes

• Genetic variation through meiosis (crossing over, independent assortment)

• Cancer and uncontrolled cell division

• Apoptosis and its role in development and tissue maintenance