How can a comparison show both inherited differences and growing conditions?
Submit: An evidence record, explanation and revision.
Related lesson: Genetics and Heredity
This is a teacher-led extension beyond the short lesson. The task supplies a performance opportunity; completion alone does not certify mastery, full NGSS coverage or state alignment.
Teacher review guideBuild the idea
Growth can depend on inherited traits and environmental conditions such as water or light. Groups must be compared under matched conditions. A difference between two individual plants cannot by itself separate genetics, environment and chance.
Science / engineering practice
Constructing explanationsCore idea
Genetic and environmental factors influence growthCrosscutting concept
Cause and effectEvidence and model inputs
Invented classroom data: mean height gain in cm for plant line A under adequate/limited water: 12/5; line B: 18/7. Each group has six same-age plants under matching light and soil. Individual ranges overlap: A adequate 9–15, B adequate 13–23. Lines are assumed to differ genetically for this model; these are not observations of a named species.
Keep actual observations, published findings and invented model cases labeled separately. If a source or required equipment is unavailable, pause that part with a teacher; do not invent results.
Materials and preparation
Paper, graph paper or spreadsheet, and the linked readings.
Grade-level scope
No gene regulation, biochemical mechanisms or claims about human group differences.
Do the work
- Graph all four means and annotate sample size and ranges.
- Compare watering within each line, then lines within each watering condition.
- Construct an explanation using both inherited and environmental factors.
- Identify missing information such as starting height, random assignment and variation in limited-water groups.
- Propose a replicated growth investigation that could test the explanation without claiming molecular mechanisms.
Learner worksheet
Write on paper or type here and print. Entries stay in this page’s memory and are lost when you leave or reload; they are not saved or submitted.
Check your reasoning
- Which comparison addresses water within A?
- Does B always exceed every A plant?
- Can the record name a responsible gene?
- What does the pattern support?
Teacher review guide
Review the actual deliverable and discuss the reasoning. For each criterion, use 0 when evidence is absent or fundamentally incorrect, 1 when partly supported with a material error or omission, and 2 when accurate, supported and complete for the stated task. Maximum 8 points is a task score, not a proficiency certification. Give feedback and allow revision.
- Uses matched comparisons for both factors.
- Interprets means with variation.
- Explains joint influences without genetic determinism.
- Proposes controls and acknowledges missing evidence.
Answer guidance for the reasoning checks
Which comparison addresses water within A?
12 versus 5 cm.
Does B always exceed every A plant?
No. The adequate-water ranges overlap.
Can the record name a responsible gene?
No. It supplies no molecular evidence.
What does the pattern support?
Both growing conditions and line differences are associated with growth in this model.
Access, support and extension
Offer read-aloud support, labeled diagrams, larger print or an oral/recorded explanation while preserving the scientific reasoning. A partner or teacher can handle physical manipulation while the learner plans, records and interprets. Use a teacher-provided measured dataset only when its provenance and limitations are explicit; it does not replace conducting an investigation when that is the assessed practice. For greater independence, remove prompts and ask learners to compare a second explanation or test another justified revision.
Sources and standard reference
- Official NGSS MS-LS1-5 performance expectation — inspect the practice, core idea, crosscutting concept and assessment boundary.
Instructional text and hypothetical cases are original. Linked source readings supply published evidence where specified. Teachers should judge fit with their course and state requirements.