Differentiation: a developing cell gains a particular role
| English | 中文 | Pinyin |
|---|---|---|
| differentiation/ˌdɪfəˌrenʃɪˈeɪʃn/ | 细胞分化 | xì bāo fēn huà |
| repair/rɪˈpeə/ | 修复 | xiū fù |
What would explain this observation?
- A developing organism needs cells with different tasks. Producing more cells is not the same as making those cells become specialized.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Differentiation 细胞分化 is the process by which a cell becomes specialized. As it develops, the cell acquires particular sub-cellular structures suited to its function. Most types of animal cell differentiate early in development. Many plant cells retain the ability to differentiate throughout life.
- differentiation: The process by which a cell becomes specialized; repair 修复: Restoration of damaged tissue through appropriate cellular processes.
What distinguishes differentiation from mitosis?
In a mature animal, cell division mainly supports repair and replacement. Differentiation and mitosis have different roles: division increases cell number, while differentiation changes the functional type. Cells in a growing root can continue producing new plant tissues because developing cells can still specialize.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- In a mature animal, cell division mainly supports repair and replacement. Differentiation and mitosis have different roles: division increases cell number, while differentiation changes the functional type. Cells in a growing root can continue producing new plant tissues because developing cells can still specialize.
- Use a model lineage that distinguishes division arrows from differentiation arrows. Label an undifferentiated starting cell, the increase in number, and the later cell functions. Compare plants and animals without claiming that no adult animal cell can divide or that every adult cell can form every tissue.
Which two habits make the investigation or model in this case more defensible?
Use a model lineage that distinguishes division arrows from differentiation arrows. Label an undifferentiated starting cell, the increase in number, and the later cell functions. Compare plants and animals without claiming that no adult animal cell can divide or that every adult cell can form every tissue.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: one model precursor divides into two, then each divides once more, giving four cells. If two become one tissue type and two another, cell number remains four during the stated specialization step. Four cells were produced by division; the later differences are explained by differentiation.
One precursor completes three rounds of model division before differentiation. How many cells result? Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
One precursor completes three rounds of model division before differentiation. How many cells result?
The result is 8 cells. Known: one model precursor divides into two, then each divides once more, giving four cells. If two become one tissue type and two another, cell number remains four during the stated specialization step. Four cells were produced by division; the later differences are explained by differentiation.
Check the conclusion and its limits
- Differentiation does not mean a cell simply gets larger, and it does not usually mean the cell receives a completely new genome. Mature animal repair still depends on some cells dividing, even though most differentiated cells have restricted roles.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Differentiation always doubles cell number. This claim is false: Differentiation does not mean a cell simply gets larger, and it does not usually mean the cell receives a completely new genome. Mature animal repair still depends on some cells dividing, even though most differentiated cells have restricted roles.
Differentiation: a developing cell gains a particular role: In a mature animal, cell division mainly supports repair and replacement. Differentiation and mitosis have different roles: division increases cell number, while differentiation changes the functional type. Cells in a growing root can continue producing new plant tissues because developing cells can still specialize.
Differentiation always doubles cell number.
Differentiation does not mean a cell simply gets larger, and it does not usually mean the cell receives a completely new genome. Mature animal repair still depends on some cells dividing, even though most differentiated cells have restricted roles.
The process by which a cell becomes specialized: write the technical term.
differentiation means The process by which a cell becomes specialized.