HS-LS1-4
The standard
Use a model to illustrate the role of cellular division (mitosis) and differentiation in producing and maintaining complex organisms.
Next Generation Science Standards
What this standard means
Students need to use a model to show how one fertilized egg can become a body with many cells, tissues, and organs. They should connect mitosis to growth and repair, and connect differentiation to cells becoming specialized for different jobs.
Mastery looks like explaining a diagram, animation, or physical model without just naming mitosis steps. Students should show that cell division increases cell number, while differentiation changes cell function. Common sticking points are thinking all cells are identical, confusing meiosis with mitosis, or saying cells “choose” jobs without explaining specialization.
Ways to teach it
- Have students build a paper cell lineage tree from one starting cell, using colors to mark muscle, nerve, blood, and skin cell types.
- Ask students to explain why a cut heals with skin cells instead of random body cells, using the words division and differentiation.
- Show a simple embryo-to-tissue diagram and have students label where cell number increases and where cell specialization happens.
- Connect to cancer treatment by asking how uncontrolled cell division differs from normal growth and repair in a healthy body.
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Related standards
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Develop models to describe that organisms have unique and diverse life cycles but all have in common birth, growth, reproduction, and death.
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Develop and use a model to describe the function of a cell as a whole and ways parts of cells contribute to the function.