How do selective breeding and genetic engineering differ?
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
Selective breeding chooses parents with desired inherited traits over generations. Genetic engineering changes genetic material using biotechnology. Both can influence inherited characteristics, but they use different methods and neither guarantees that every outcome is beneficial in every environment.
Science / engineering practice
Obtaining, evaluating and communicating informationCore idea
Technologies can influence inheritance of desired traitsCrosscutting concept
Cause and effectEvidence and model inputs
Source reading task: FDA’s explanation of agricultural biotechnology distinguishes conventional breeding and genetic engineering; NHGRI’s agriculture page explains selective breeding and genomic tools. Choose one food-crop example from the FDA reading. Separate a documented trait and method from a marketing claim about quality.
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 required molecular engineering protocols or blanket safety judgments.
Do the work
- Extract each source’s description of how the method works.
- Make a two-column comparison: human action, inherited material, timescale and limits.
- Trace a selected crop example from desired trait to method and possible outcome.
- Assess a claim that “all breeding is the same” using the method differences.
- Write an information brief naming sources, a potential benefit and a question requiring more evidence.
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
- Does selecting parents directly edit a particular DNA sequence?
- Is an acquired haircut inherited through breeding?
- Does a technique label prove a food’s quality?
- Why use two sources?
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.
- Accurately distinguishes the two methods.
- Explains human influence on inherited traits.
- Synthesizes sources into a crop example.
- Evaluates a claim with a benefit and evidence limitation.
Answer guidance for the reasoning checks
Does selecting parents directly edit a particular DNA sequence?
Not by itself. It changes which inherited variants are passed on through breeding.
Is an acquired haircut inherited through breeding?
No. The example must involve inherited variation.
Does a technique label prove a food’s quality?
No. Evaluate the specific trait and evidence.
Why use two sources?
They support distinct method definitions and allow a more complete comparison.
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-LS4-5 performance expectation — inspect the practice, core idea, crosscutting concept and assessment boundary.
- FDA agricultural biotechnology
- NHGRI agriculture and breeding
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.