Impacts of Trait Technology - Middle School Life Science
- What is one food safety concern that must be tested for new GM foods?
- Possible allergenicity of new proteins. New proteins might trigger allergic reactions.
- Which impact on organisms is most directly linked to low genetic diversity in a breed?
- Higher chance that a single disease can affect many individuals. Similar genes mean similar weaknesses to pathogens.
- What is a possible ecological risk if a genetically modified trait spreads to wild relatives?
- Gene flow that can change wild populations and ecosystems. Modified genes could spread to native species through reproduction.
- What is genetic engineering?
- Directly changing an organism's DNA to alter traits. Modern biotechnology modifies genes at molecular level.
- What is a key organism-level risk of selective breeding focused on one trait?
- Reduced genetic diversity and increased inherited disorders. Inbreeding increases harmful recessive allele expression.
- Which option is most likely to increase biodiversity: monoculture or diverse crop varieties?
- Diverse crop varieties. Multiple varieties preserve genetic diversity.
- What is gene flow, and why does it matter for trait selection technologies?
- Movement of genes between populations; traits can spread to wild relatives. Modified genes could transfer to wild plants through breeding.
- What is a major benefit of engineering crops for drought or salt tolerance?
- Improved yield stability in harsh environments. Plants survive better where water or soil conditions limit growth.
- What is one potential environmental risk of herbicide-tolerant crops?
- Herbicide-resistant weeds can evolve. Overuse creates selection pressure for resistance.
- Which option is the clearest example of genetic engineering: inserting a gene or choosing parents?
- Inserting a gene. Adding foreign DNA is the hallmark of genetic engineering.
- What is a genetically modified organism (GMO)?
- An organism with DNA altered using genetic engineering. Contains artificially inserted or modified genes.
- What is a key benefit of trait selection technologies for agriculture?
- Higher yield or improved resistance to pests, disease, or drought. Modified traits help crops survive and produce more.
- What is a common societal concern about patents on genetically engineered seeds?
- Farmers may depend on companies for seed access. Corporate control limits farmer independence.
- What is genetic engineering in the context of trait selection technologies?
- Directly changing an organism's DNA to add, remove, or alter traits. Scientists modify DNA sequences to introduce new traits or remove unwanted ones.
- Which option best explains why a pest population may rebound after repeated pesticide use?
- Resistant pests survive and reproduce, increasing resistance in the population. Natural selection favors resistant individuals when pesticides kill others.
- What is selective breeding (artificial selection) in organisms?
- Human-chosen mating to increase desired traits over generations. Humans control breeding to enhance specific characteristics.
- Identify the ecological impact when one selected trait spreads widely in a population.
- Reduced genetic diversity. Uniform traits reduce population's genetic variation.
- What is a key disadvantage of selective breeding for extreme traits in animals?
- Increased health problems due to limited gene pool. Inbreeding for specific traits causes genetic disorders.
- Identify the best overall approach to evaluate a trait technology: consider only benefits or weigh risks and benefits?
- Weigh risks and benefits using evidence. Scientific evaluation requires balanced analysis.
- Which is a common goal of trait selection in crops: higher yield, lower yield, or no change?
- Higher yield. Farmers select traits to maximize crop production.
- What is the key difference between somatic cell gene therapy and germline editing?
- Somatic affects one person; germline changes can be inherited. Somatic changes die with the person; germline passes to offspring.
- What is one potential environmental benefit of pest-resistant crops?
- Reduced use of chemical insecticides. Crops that resist pests naturally don't need chemical spraying.
- What is the most common societal benefit claimed for GM crops?
- Improved food supply through increased productivity and reduced losses. More efficient farming helps feed growing populations.
- What is cloning as a trait selection technology?
- Making a genetically identical copy of an organism. Creates exact genetic duplicates through technology.
- What is an ethical concern about editing human embryos for non-medical traits?
- It can increase inequality and raises consent concerns. Designer babies create social and ethical dilemmas.
- Which outcome best indicates reduced genetic diversity in a crop: many varieties grown or one variety dominates?
- One variety dominates. Monoculture lacks genetic variation for disease resistance.
- What is pesticide or herbicide resistance in pests or weeds most likely to result from?
- Strong selection pressure favoring resistant individuals. Chemicals kill susceptible pests, leaving only resistant ones to reproduce.
- What is one major benefit of selecting pest-resistant crop traits?
- Reduced crop loss from insects and other pests. Built-in resistance saves crops without pesticides.
- What is selective breeding (artificial selection)?
- Choosing parents with desired traits to produce offspring with those traits. Humans control mating to pass on specific characteristics.
- What technology uses CRISPR to edit genes at specific DNA locations?
- CRISPR-Cas9 gene editing. Revolutionary tool for precise genetic modifications.
- Identify the best example of selective breeding: choosing two high-milk cows to mate or inserting a gene into corn?
- Choosing two high-milk cows to mate. Traditional breeding pairs organisms with desired traits.
- What is one potential ecological risk of releasing a GMO into the environment?
- Gene flow to wild relatives, possibly creating hard-to-control populations. Modified genes might spread to wild species uncontrollably.
- What is the main biological risk of selective breeding over many generations?
- Reduced genetic diversity, increasing disease and environmental vulnerability. Less variety means less ability to adapt to threats.
- What is pesticide resistance as an unintended impact of trait selection technologies?
- Pests evolve to survive a control method, reducing its effectiveness. Organisms adapt to survive treatments meant to kill them.
- What is a common ecological risk if a genetically engineered organism escapes into the wild?
- It may spread traits and disrupt ecosystems or outcompete natives. Modified genes could harm native species and food webs.
- Which impact is an example of a benefit of trait selection in crops?
- Higher yield or improved resistance to pests or disease. Modified traits help crops produce more food or survive threats.
- What is gene flow in the context of GM crops and wild plants?
- Movement of genes between populations through reproduction (such as pollen). Genes spread naturally through breeding and pollination.
- What is inbreeding depression most directly caused by in selective breeding programs?
- Increased expression of harmful recessive alleles. Related parents share harmful alleles that become homozygous in offspring.
- What is one major biological risk of selective breeding in a population over many generations?
- Reduced genetic diversity. Breeding similar individuals reduces the variety of alleles in the gene pool.
- What is gene editing (for example, CRISPR) in simple terms?
- A method that precisely cuts and changes specific DNA sequences. Acts like molecular scissors to edit genetic code.
- What is a likely long-term result of widespread use of a single pest-resistant crop trait?
- Pests may evolve resistance through natural selection. Surviving pests reproduce, passing resistance to offspring.
- What is the difference between somatic and germline genetic changes in humans?
- Somatic affects one person; germline is heritable by offspring. Germline changes pass to future generations permanently.
- What is a gene drive intended to do in a wild population?
- Spread a chosen gene through a population rapidly. Engineered inheritance biases offspring traits.
- Which option is the clearest example of selective breeding: crossing two dogs or inserting a gene?
- Crossing two dogs. Traditional breeding involves selecting parent organisms.
- What is a major benefit of engineering crops for pest resistance?
- Reduced crop loss and potentially reduced insecticide use. Built-in protection decreases chemical pesticide needs.
- Which option best describes why cloning can be risky for a population: low diversity or high diversity?
- Low diversity. Clones are identical, reducing genetic variation.
- What is genetic engineering in the context of trait selection technologies?
- Directly changing DNA to add, remove, or alter a trait. Scientists modify genetic material at the molecular level.
- Which impact is an example of a benefit of trait selection in livestock?
- Improved growth rate or increased milk or egg production. Selected traits increase productivity in farm animals.
- Identify the best conclusion: A GM trait spreads to wild plants; what impact is most likely increased?
- Risk of ecological imbalance from new traits in wild populations. New traits in wild species can disrupt natural ecosystems.
- What is a medical benefit of genetic engineering using microbes (such as bacteria)?
- Production of medicines like human insulin. Engineered bacteria produce human proteins efficiently.
- What is gene editing (for example, CRISPR) compared with older genetic engineering?
- More precise DNA changes at a targeted location. CRISPR allows specific gene targeting unlike random insertion.
- Identify the most direct societal impact if only wealthy groups access trait-selection therapies.
- Increased inequality in health outcomes and opportunities. Creates genetic advantages available only to those who can afford them.
- Which option best describes an unintended consequence of trait selection: trade-off effects or guaranteed improvement?
- Trade-off effects. Improving one trait often worsens another trait.
- Identify the most likely outcome if a crop variety is genetically uniform and a new pathogen appears.
- Rapid, widespread crop loss due to similar susceptibility. Uniform genetics means all plants share the same weakness.
- What is a major concern about unintended effects of gene editing?
- Off-target changes that may cause unexpected traits or health issues. Gene editing tools might accidentally alter unintended DNA sequences.
- Which option is the best example of an organism-level benefit of gene editing in medicine?
- Correcting a harmful mutation to reduce or prevent a genetic disorder. Gene therapy can fix disease-causing mutations at the DNA level.
- Identify the most likely outcome if a single crop variety is planted widely for many years.
- Higher vulnerability to a new disease due to low genetic diversity. Lack of genetic variation makes all plants susceptible to the same threats.
- What is gene flow in the context of GM crops and wild relatives?
- Movement of genes from crops into wild populations. Modified genes can spread to related wild species.
- What is a genetically modified organism (GMO)?
- An organism whose DNA has been altered using genetic engineering. Scientists have modified its genetic code through laboratory techniques.
- What is one human health benefit of biofortified crops (for example, added vitamins)?
- Improved nutrition and reduced deficiency diseases. Engineered nutrients help prevent malnutrition.
- What is an ethical concern specific to selecting traits in humans?
- It can increase inequality and discrimination by valuing some traits over others. Choosing 'better' traits implies others are inferior.
- What is selective breeding?
- Choosing parents with desired traits to produce offspring. Traditional method using controlled mating over generations.
- Which term describes choosing parents with desired traits to influence offspring traits?
- Selective breeding (artificial selection). Humans choose which organisms reproduce based on desired characteristics.
- What is a major risk of releasing organisms with a gene drive into ecosystems?
- Hard-to-reverse changes to ecosystems and species balance. Permanent ecological changes are unpredictable.
- Identify the best example of genetic engineering: crossing two dog breeds or adding a vitamin-producing gene to rice?
- Adding a vitamin-producing gene to rice. Gene insertion creates traits impossible through breeding.
- Which action best reduces ecological risk from GM crops: planting near wild relatives or using buffer zones?
- Using buffer zones. Physical separation prevents gene flow to wild plants.
- What is genetic engineering in trait selection technologies?
- Directly changing DNA to add, remove, or alter traits. Scientists modify genes at the molecular level.
- What is cloning in biology as a trait selection technology?
- Producing a genetically identical copy of an organism or cell. Creates exact genetic duplicates through asexual reproduction.
- What is a major societal concern about trait selection technologies in agriculture?
- Unequal access and increased dependence on companies that control seeds. Technology costs may widen gaps between rich and poor farmers.
- What is the main ethical concern about editing human embryos for non-medical traits?
- It can create unfair advantage and raises consent and safety issues. Designer babies could divide society and lack informed consent.