biology / Cells & Energy / free

Cell Cycle & Mitosis

Follow a cell through growth, DNA duplication, checkpoints, and division.

Follow the mechanism1 / 3

The cell grows and copies DNA. Growth and S phase create the material and duplicated chromosomes needed for two daughter cells.

cell cycle / mitosisG2 checkpoint · ready to divide

Focus the idea

phaseG2 checkpoint

checkpointpass

chromosome stateduplicated chromosome

integrity risk18%

Cycle phase 3Checkpoint confidence 78%DNA duplication 86%Spindle attachment 82%

The G2/M checkpoint is pass. The cell holds progression until DNA is sufficiently copied, damage is controlled, and the relevant division machinery is ready.

This is a normalized cell-cycle model, not a clinical cell assay. Real cells use cyclin–CDK oscillations, DNA-damage repair, centrosomes, kinetochore attachment, apoptosis, and tissue-specific checkpoints.

Guided journey

Follow the mechanism.

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01 / Grow

The cell builds material and checks that conditions support another cycle.

What changes next: Growth prepares the cell before it copies its genome.

04 / PRACTICE

Make the biology yours.

0 / 3 checked

Answer from the model, then use the explanation to connect the visual mechanism to the biological rule.

CHECK 1 / 3

Cell Cycle & Mitosis

Follow the mechanism.

The cell builds material and checks that conditions support another cycle.

Make the biology yours.

What must happen before sister chromatids can separate?