Use these targets, vocabulary, rubrics, examples, and score sheet with the instructor's approved lesson and procedure. This is an assessment companion, not a complete lesson or safety authorization.
Student lessons, data, and public practice answers (not assessment keys): Unit 08 learning pathway.
The student demonstrates the following:
Five science criteria plus separately reported integration (Page 3).
Locate and explain a structure on a specimen, out loud.
The student tells homology from analogy on the specimens (Page 4).
Cross-specimen comparisons and the common-descent argument kept distinct.
You are making a decision, not adding up points. For each criterion, decide whether the work is Developing, Proficient, or Mastery — the column language tells you which. Live-defense criteria are mastered only when an educator observes them; comparison and explanation criteria can be mastered on the approved specimen, image, model, or virtual route without penalty. Each student has three tokens per term; each token retries one rubric criterion. Approved accommodations, equipment failures, and approved absences are handled separately and do not consume these tokens.
Accept listed synonyms; use the distinction column to resolve near-matches.
| Term | Accepted explanation | Distinction |
|---|---|---|
| Homology | homologous structure | Same body plan and shared descent, not merely the same job |
| Analogy | analogous structure | Same function, separate origin; not evidence of descent |
| Comparative anatomy | cross-specimen study | Tracing one structure across species to line up the parts |
| Vestigial structure | reduced structure | Inherited from an ancestor but reduced in size or use |
| Dissection defense | oral defense | Explaining a structure on the specimen, aloud, under questioning |
| Common descent | shared ancestry | Species share ancestors; homology is evidence for it |
| Homologous forelimb | shared ancestral forelimb | Tetrapod bones may be fused or reduced; not every limb has five digits |
| Owen homology | Owen term (1843) | Owen named it; Darwin later read it as evidence of descent |
| Cross-specimen comparison | comparison across approved specimens or models | Must name the structures, evidence, and limit. |
| Branching common descent | shared ancestry on a tree | Living species are branches, not steps. |
| Evidence limit | what the specimen cannot settle | State what fossils, DNA, development, or broader sampling would add. |
The split between Proficient and Mastery is the specimen, not the book: a mastered defense reads the structure off the tray and holds up under a follow-up question. Ask “show me that structure and tell me what it does.”
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Comparing structures across specimens | Cannot locate the same organ system in two specimens. | Finds both systems but assumes a shared job proves homology. | Compares an organ system in two specimens or approved models and distinguishes shared function from evidence of shared ancestry. |
| Homology vs. analogy | Treats any two structures that do the same job as the same structure. | Uses the words homology and analogy but applies them to the wrong examples. | Distinguishes homologous structures, analogous functions, and unresolved comparisons on the approved specimens, images, models, or virtual route. |
| The dissection defense | Cannot locate or name the requested structure on the specimen when asked aloud. | Finds and names the structure but cannot explain its function or answer a follow-up question. | Locates, identifies, and explains a structure’s function on the specimen out loud under instructor questioning; this live defense criterion requires educator observation. |
| The common-descent argument | Cannot relate anatomical evidence to common descent. | Names homology but treats living species as successive ancestors. | Explains the shared tetrapod forelimb pattern and places specimens on a branching tree while stating what fossil, DNA, development, or broader evidence adds. |
| Synthesis & careful communication | Reports expected rather than observed anatomy; handles specimens carelessly. | Names most structures but blurs observation and inference. | Uses accurate terms, separates observation from inference, handles specimens respectfully when observed, and communicates comparison limits carefully. |
| Integration (cross-domain) | Makes no supported connection between the source and the science. | Uses the source but needs help connecting evidence, writing, or limitations to the science. | Independently connects History, Reading, and Writing using a cited source, appropriate evidence, a limitation, and a scientific explanation. |
Read these before you grade. They show what Mastery and Developing actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Comparing structures across specimens | Dev / Prof / Mast | |
| 2 | Homology vs. analogy | Dev / Prof / Mast | |
| 3 | The dissection defense | Dev / Prof / Mast | |
| 4 | The common-descent argument | Dev / Prof / Mast | |
| 5 | Synthesis & careful communication | Dev / Prof / Mast | |
| 6 | Integration (cross-domain) | Dev / Prof / Mast |
☐ No ☐ Yes — for criterion: __________
Tokens left this term after this session (choose one): ☐ 3 ☐ 2 ☐ 1 ☐ None left
Each student has three tokens per term; each token retries one rubric criterion. Approved accommodations, equipment failures, and approved absences are handled separately and do not consume these tokens.
Dev = Developing · Prof = Proficient · Mast = Mastery · Unsure between two levels? Circle the lower one and note what a re-do would need.