--- title: "Genetically Engineered Crops — AP Enviro Definition" description: "Genetically engineered crops are modified to resist pests and disease, a Green Revolution strategy tested in AP Enviro Unit 5 for its tradeoffs in yield and biodiversity." canonical: "https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops" type: "key-term" subject: "AP Environmental Science" unit: "Unit 5" --- # Genetically Engineered Crops — AP Enviro Definition ## Definition In AP Environmental Science, genetically engineered crops are plants whose DNA has been altered to boost resistance to pests and diseases, increasing crop yields but potentially reducing the genetic diversity of that crop. ## What It Is Genetically engineered crops are plants whose genes have been directly modified in a lab to give them traits they wouldn't develop on their own, most often [resistance](/ap-enviro/unit-5/pest-control-methods/study-guide/dXLmUIL3KlkvJHKqr02Z "fv-autolink") to pests and diseases. They're one of the headline strategies of [the Green Revolution](/ap-enviro/unit-5/green-revolution/study-guide/peuUQ0oN39WWAmVQVC2g "fv-autolink"), the big shift in farming that aimed to crank up global food production (EK EIN-2.C.1). The AP angle is all about tradeoffs. On the plus side, engineering a crop to fight off insects or disease means less crop damage and higher yields, and it can cut down on the pesticides a farmer needs to spray. The catch (EK EIN-2.G.2) is that when everyone plants the same engineered variety, the crop loses [genetic diversity](/ap-enviro/key-terms/genetic-diversity "fv-autolink"). A field of identical plants is a sitting duck if a new pest or disease shows up that the engineered trait can't stop. ## Why It Matters This term lives in [Unit 5](/ap-enviro/unit-5 "fv-autolink"): Land and Water Use, and it shows up in two places. Topic 5.3 (The Green Revolution) lists GMOs as one of the practices that reshaped modern agriculture, tied to learning objective [AP Enviro](/ap-enviro "fv-autolink") 5.3.A. Topic 5.6 (Pest Control Methods) treats engineered crops as an alternative to spraying chemicals, under AP Enviro 5.6.A. The CED wants you to weigh benefits against drawbacks, so this term is your go-to example for any question asking you to evaluate a farming or pest-control method instead of just naming it. ## Connections ### Genetic resistance and artificial selection (Unit 5) Pesticides accidentally breed tough pests because the survivors pass on resistance genes ([artificial selection](/ap-enviro/key-terms/artificial-selection "fv-autolink")). Engineered crops flip the script: instead of waiting for nature, scientists build resistance straight into the plant's DNA. ### The pesticide treadmill (Unit 5) Spraying more chemicals just selects for hardier pests, forcing even more spraying. Engineered crops are pitched as a way off that treadmill, though resistance can still evolve if pests [adapt](/ap-enviro/unit-2/adaptations/study-guide/NHy6ed9wummAeB8F0UDq "fv-autolink") to the engineered trait. ### The Green Revolution (Unit 5) Engineered crops are part of the same package as mechanization, [fertilization](/ap-enviro/key-terms/fertilization "fv-autolink"), and irrigation. All of them boosted yields, and all of them came with environmental costs, which is exactly the positive-and-negative framing topic 5.3 wants. ### Loss of biodiversity (Units 2 and 5) Planting one engineered variety everywhere shrinks the gene pool of that crop. Lower genetic diversity means lower resilience, the same vulnerability idea that runs through biodiversity content elsewhere in the course. ## On the AP Exam Expect multiple-choice stems that ask you to identify a benefit (higher yields, less crop damage, reduced pesticide use) or a drawback (loss of genetic diversity in the crop). Questions also ask why a farmer would choose engineered crops and how those crops affect biodiversity. The move the exam wants: don't just say GMOs are good or bad. Name a specific benefit AND a specific drawback. On a free-response question about agricultural or pest-control methods, engineered crops make a strong example as long as you can explain the genetic-diversity tradeoff, not just mention the term. ## genetically engineered crops vs pesticides Both reduce pest damage, but they work differently. Pesticides are chemicals sprayed onto crops, and overuse breeds resistant pests (the pesticide treadmill). Genetically engineered crops build pest resistance into the plant itself. The shared downside is different: pesticides can harm non-target organisms and select for resistant pests, while engineered crops mainly threaten the crop's own genetic diversity. ## Key Takeaways - Genetically engineered crops have their DNA altered to resist pests and diseases, which raises crop yields and reduces damage. - The main AP drawback is loss of genetic diversity in that crop, leaving fields vulnerable if a new threat appears. - Engineered crops (GMOs) are one of the core Green Revolution strategies in topic 5.3, alongside mechanization, fertilization, and irrigation. - On any pest-control question, pair a benefit (higher yield, less pesticide) with a drawback (reduced genetic diversity) to get full credit. - Unlike pesticides, which cause artificial selection for resistant pests, engineered crops build resistance directly into the plant. ## FAQs ### What are genetically engineered crops in AP Environmental Science? They're crops whose genes have been modified to increase resistance to pests and diseases (EK EIN-2.G.2). The exam frames them as a Green Revolution strategy that raises yields but can reduce a crop's genetic diversity. ### Are genetically engineered crops good or bad for the AP exam? Neither, and that's the point. The CED wants you to weigh both sides: benefits like higher yields and less pesticide use, against the drawback of lost genetic diversity. A one-sided answer loses points. ### How are genetically engineered crops different from pesticides? Pesticides are chemicals sprayed on plants, and overusing them breeds resistant pests through artificial selection. Engineered crops put pest resistance into the plant's own DNA, so the big risk shifts from resistant pests to the crop losing genetic diversity. ### How do genetically engineered crops affect biodiversity? When farmers plant one engineered variety everywhere, the crop's genetic diversity drops. A less diverse crop is more fragile, so a single new pest or disease could wipe out large areas. ### Why would a farmer choose genetically engineered crops? Because they cut crop damage from pests and disease, raise yields, and can reduce how much pesticide a farmer has to buy and spray, all of which improve profits and efficiency. ## Related Study Guides - [5.3 The Green Revolution](/ap-enviro/unit-5/green-revolution/study-guide/peuUQ0oN39WWAmVQVC2g) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops#resource","name":"Genetically Engineered Crops — AP Enviro Definition","url":"https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-06-11T05:58:32.626Z","isPartOf":{"@type":"Collection","name":"AP Environmental Science Key Terms","url":"https://fiveable.me/ap-enviro/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops#term","name":"genetically engineered crops","description":"In AP Environmental Science, genetically engineered crops are plants whose DNA has been altered to boost resistance to pests and diseases, increasing crop yields but potentially reducing the genetic diversity of that crop.","url":"https://fiveable.me/ap-enviro/key-terms/genetically-engineered-crops","inDefinedTermSet":{"@type":"DefinedTermSet","name":"AP Environmental Science Key Terms","url":"https://fiveable.me/ap-enviro/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What are genetically engineered crops in AP Environmental Science?","acceptedAnswer":{"@type":"Answer","text":"They're crops whose genes have been modified to increase resistance to pests and diseases (EK EIN-2.G.2). 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