Cell Division Lab
One big idea, three levels of explanation. Choose a grade band, investigate a phenomenon, and use a model to explain what you observe.
How can one tiny seed become a whole plant?
The plant gets much larger—but its tiny living building blocks stay tiny. What changes?
How can one changed cell affect a whole person?
Most cells follow signals that tell them when to divide and stop. What happens when one cell stops following those signals?
How do cell-cycle changes become cancer—and can they be inherited?
Follow a mutation from DNA through mitosis, tissue growth, an organ system, and the whole organism.
Teacher Notes · Standards, boundaries, and suggested use
Upper Elementary
Use: Move through all four scales, but assess visible growth and plant structures.
Keep: organism, root/shoot systems, tissue as a group of cells, and cells as tiny living building blocks.
Avoid assessing: chromosomes or named mitosis phases.
Middle School
Use: Turn on the failed stop signal, move time forward, and revisit each scale.
Keep: cell → tissue → organ system → organism cause-and-effect reasoning.
Boundary: Cancer is simplified to disrupted division control; detailed mutations and phase names are reserved for high school.
High School
Use: Compare somatic and germline origins, then test accumulated control failures.
Keep: chromosomes through mitosis, checkpoints, division/death balance, and inherited risk versus acquired tumor mutations.
Model limit: Real cancers involve many genes, cell types, immune responses, and environmental interactions.
Research basis: NGSS 3-LS1-1 · NGSS 4-LS1-1 · NGSS MS-LS1-1 · NGSS HS-LS1-4 · NGSS HS-LS3-1 · NGSS HS-LS3-2 · NCI Cancer Genetics
About the illustrations
These original vector illustrations are teaching models, not photographs or diagnostic images. Colors are chosen to separate structures. Each scale is enlarged independently; image size is not a measure of biological size. The tissue view is histology-inspired, not a measured tissue sample.
The chromosome sequence uses four representative chromosomes to make copying and separation visible; human body cells normally have 46 chromosomes. The stage buttons depict a division sequence, while the cycle-run control advances the separate tissue-population model.
Biological reference checks: OpenStax: The Cell Cycle and OpenStax: Small and Large Intestines.