Impacts of Trait Technology

Help Questions

Middle School Life Science › Impacts of Trait Technology

Questions 1 - 10
1

A plant breeder used selective breeding to develop wheat that produces more grain per plant. In test plots, yield increased by 18%. But the new variety had shallower roots, and during a drought year its yield dropped 25% more than the older variety. Which statement about impacts is supported by the evidence and shows a tradeoff?

The technology increased yield under some conditions, but the shallower roots may reduce performance during drought, showing benefits and drawbacks.

Root depth is not an impact of selective breeding because breeders only choose grain traits.

Because both varieties are wheat, there cannot be meaningful differences caused by breeding.

Higher yield in test plots means the new wheat will always produce more grain in every environment.

Explanation

The core skill is examining the impacts of selective breeding on crop performance across varying conditions. These technologies have impacts by optimizing certain traits but affecting others like root structure. Evidence highlights benefits such as higher wheat yields in normal conditions, but drawbacks like greater yield drops during droughts. A checking strategy is to compare yield data from different environmental tests. A misconception is that breeding for one trait doesn't influence unrelated characteristics. Evaluating impacts requires considering tradeoffs, where productivity gains may reduce resilience. Evidence from multi-year studies provides a full picture of effectiveness.

2

A lab used cloning to produce animals with the same traits as a prize-winning sheep (high-quality wool). The cloned sheep produced wool similar in quality to the original. However, the cloning success rate was low (only 8% of embryos became healthy lambs), and some clones had health problems early in life. What evidence shows a tradeoff in the impacts of this technology?

Low success rate does not matter because the intention is to copy traits.

Wool quality was similar, and cloning had low success with some health problems, showing both benefits and drawbacks.

Because the sheep look similar, there are no drawbacks to cloning.

If clones have health problems, then wool quality data should be ignored as not real evidence.

Explanation

The core skill is recognizing tradeoffs in cloning technologies for replicating desirable animal traits. These technologies have impacts by copying traits but facing efficiency and health issues. Evidence demonstrates benefits like consistent wool quality in sheep, but drawbacks including low success rates and early health problems. A checking strategy is to review production outcomes and health records. A misconception is that visual similarity means no underlying differences or risks. Evaluating impacts requires considering tradeoffs, where trait replication comes with procedural challenges. Evidence from lab results provides a balanced view of cloning's value.

3

A conservation team used assisted gene flow (moving individuals with heat-tolerant traits into a warmer region) to help a tree species survive rising temperatures. After planting, the mixed population had 30% higher survival during heat waves than the local-only population. However, seedlings from the moved trees grew more slowly in cooler years, and some had lower resistance to a local fungus. Which evaluation best reflects the impacts of this technology based on the evidence?

Because the goal was to help trees, slower growth and fungus resistance should not be considered impacts.

The results prove the technology controls the environment, so cooler years will no longer happen.

The technology improved survival in heat waves but may reduce growth in cooler years and lower fungus resistance, showing tradeoffs.

If survival increased once, the technology will improve every trait in every year.

Explanation

The core skill is evaluating the impacts of assisted gene flow on species adaptation to climate change. These technologies have impacts by introducing tolerant traits but altering other resistances. Evidence indicates benefits like higher tree survival in heat, but drawbacks such as slower growth in cool conditions and reduced fungus resistance. A checking strategy involves monitoring population data across weather variations. One misconception is that introducing traits improves all aspects without compromises. Evaluating impacts requires considering tradeoffs, balancing adaptation gains with potential weaknesses. Evidence from field observations ensures informed conservation decisions.

4

A crop company used a trait selection technology called genetic engineering to make corn produce a protein that kills certain insect pests. In field tests, insect damage dropped from 30% of plants to 8%, and farmers sprayed insecticide 40% fewer times. But researchers also found that pollen from these plants reduced survival of a nearby non-target butterfly species by 12% in lab feeding trials, and some pests began showing resistance after several years. Which statement about impacts is supported by the evidence and includes both benefits and drawbacks?

The technology can reduce pest damage and insecticide use, but it may also affect non-target organisms and lead to resistant pest populations.

Because the label says “pest-resistant,” pests cannot evolve resistance to it.

The corn is completely safe for all organisms because insect damage decreased.

The technology’s impact is only short‑term because the lab butterfly result does not count as evidence.

Explanation

The core skill is assessing the impacts of trait technologies such as genetic engineering on crops and ecosystems. These technologies have impacts by introducing new traits that can enhance resistance but also affect other species. Evidence demonstrates benefits like reduced insect damage and lower insecticide use in corn, but drawbacks including harm to non-target butterflies and emerging pest resistance. A checking strategy involves reviewing field tests and lab studies to weigh short-term gains against long-term risks. One misconception is that labeling a crop as 'pest-resistant' prevents any evolutionary adaptations in pests. Evaluating impacts requires considering tradeoffs, balancing agricultural benefits with ecological consequences. Evidence from multiple studies is essential for a comprehensive understanding of these technologies.

5

A wildlife program used a trait selection technology called captive breeding to increase the population of an endangered frog. After 5 years, the number of frogs released into wetlands increased from 50 to 300 per year. However, genetic tests showed the captive population had lower genetic diversity than wild populations, and released frogs had lower survival (35%) than wild-born frogs (60%) in the first year. Which evaluation best reflects the impacts of this technology based on the evidence?

Because more frogs were released, the technology has no drawbacks for the frogs or the ecosystem.

Lower survival cannot be related to captive breeding because the program intended to help the frogs.

Captive breeding increased the number of frogs released, but it may also reduce genetic diversity and lower survival after release, showing a tradeoff.

Genetic diversity does not matter as long as the frogs look healthy when released.

Explanation

The core skill is analyzing the impacts of trait selection methods like captive breeding on endangered species and biodiversity. These technologies have impacts by increasing population numbers but potentially altering genetic makeup. Evidence reveals benefits such as more frogs released into the wild, but drawbacks like reduced genetic diversity and lower survival rates post-release. A checking strategy is to examine genetic tests and survival data to identify both successes and limitations. A misconception is that higher release numbers automatically ensure species recovery without genetic considerations. Evaluating impacts requires considering tradeoffs, where population boosts might compromise long-term adaptability. Evidence-based assessments are crucial for effective conservation strategies.

6

A fish farm used a trait selection technology called selective breeding to produce salmon that grow faster. After 2 years, the bred salmon reached market size in 14 months instead of 18 months, reducing feed used per kilogram of fish by 15%. But when a storm damaged pens, some fish escaped; biologists found that the bred salmon were less able to avoid predators in the wild and could compete with wild salmon for food. Which evaluation best reflects the impacts of this technology based on the evidence?

Because the salmon are bred, they cannot escape or interact with wild salmon.

The only impact is reduced feed use; competition with wild salmon is unrelated because it was not the intention.

If the salmon grow faster, they will automatically be better at surviving in the wild.

Faster growth and lower feed use are benefits, but escapees may have lower survival and could affect wild populations, showing tradeoffs.

Explanation

The core skill is assessing the impacts of selective breeding on farmed animals and wild ecosystems. These technologies have impacts by enhancing growth traits but risking environmental interactions. Evidence shows benefits like faster salmon growth and reduced feed use, but drawbacks such as lower wild survival and competition with native species. A checking strategy involves tracking production data and ecological studies on escaped individuals. A misconception is that bred traits only affect farm settings and not natural environments. Evaluating impacts requires considering tradeoffs, balancing efficiency gains with biodiversity risks. Evidence from real-world incidents is key to understanding broader effects.

7

Scientists used a trait selection technology called selective breeding to produce dairy cows that give more milk. In one herd, average milk production increased from 20 L/day to 28 L/day after several generations. However, veterinarians also recorded that cases of hoof problems increased from 5% of cows to 14%, and the cows needed more high-energy feed to stay healthy. Which evaluation best reflects the impacts of this technology based on the evidence (benefits and drawbacks)?

The technology controls every trait, so hoof problems must be caused by something else, not breeding for milk.

Because the intention was to increase milk, the increase in hoof problems should not be counted as an impact of the technology.

The technology had a benefit (more milk) and tradeoffs (more hoof problems and higher feed needs), showing impacts can be both positive and negative.

The technology only benefits humans because higher milk production proves there are no negative effects on cows.

Explanation

The core skill is evaluating the impacts of trait selection technologies like selective breeding on organisms and their environments. These technologies have impacts by altering traits, which can improve certain outcomes but also introduce new challenges. Evidence shows benefits such as increased milk production in dairy cows, but drawbacks like higher incidences of hoof problems and greater feed requirements. A checking strategy is to compare quantitative data from before and after the technology's use, identifying both positive changes and unintended effects. A common misconception is that focusing on one beneficial trait means there are no negative consequences for the organism's overall health. Evaluating impacts requires considering tradeoffs, where gains in productivity might come at the cost of animal welfare. Relying on evidence helps in making informed decisions about the overall value of such technologies.

8

Researchers used CRISPR gene editing to change a gene in mosquitoes so fewer offspring survive (to reduce mosquito populations that spread disease). In small cage trials, mosquito numbers dropped by 90% within 6 generations. However, scientists also observed that a few mosquitoes carried mutations that made the edit less effective, and ecologists warned that reducing mosquitoes could affect animals that eat them. Which prediction about long-term impacts is supported by the evidence (benefits and drawbacks)?

The technology could reduce mosquito numbers (a potential benefit), but resistance mutations and ecosystem effects could limit or change long‑term outcomes.

The only reasonable conclusion is that the technology is bad, so the population drop data should be ignored.

Mosquito populations will definitely reach zero everywhere because CRISPR controls evolution.

Because the trial was in cages, the results prove there will be no impacts on ecosystems.

Explanation

The core skill is predicting long-term impacts of gene editing technologies like CRISPR on populations and ecosystems. These technologies have impacts by altering inheritance but facing biological resistances. Evidence suggests benefits such as reduced mosquito populations, but drawbacks including resistance mutations and potential food chain disruptions. A checking strategy is to analyze trial data and model ecological scenarios for future outcomes. One misconception is that gene edits permanently eliminate populations without adaptive responses. Evaluating impacts requires considering tradeoffs, where disease control benefits might alter ecosystems. Evidence from trials and warnings informs realistic predictions.

9

Scientists used a trait selection technology called marker-assisted breeding to choose parent corn plants that carry DNA markers linked to drought tolerance. In field tests, the new corn line produced 18% more grain than the older line during a dry season, but in a wet season it produced about the same as the older line. Farmers also reported that the new line required more careful timing of planting to avoid early-season cold stress. Which evaluation best reflects the impacts of the technology based on the evidence, including benefits and drawbacks?

The technology guarantees higher yield every year because DNA markers control the plant’s traits completely.

Because scientists intended to help farmers, the impacts must be positive overall and drawbacks should be ignored.

The technology provides a benefit in dry conditions, but it does not improve yield in all conditions and may add a limitation related to planting timing, showing tradeoffs.

The technology is harmful because any change in traits always causes new problems that outweigh benefits.

Explanation

The core skill is evaluating the impacts of trait selection technologies, such as marker-assisted breeding, by analyzing evidence of how they affect crop performance under different conditions. Technologies like this have both positive and negative impacts, including improved yields in specific environments but potential limitations in others. Evidence shows benefits like higher grain production during droughts and drawbacks like unchanged yields in wet seasons and the need for precise planting to avoid cold stress. To check the impacts, compare data from controlled tests across various conditions and note any additional requirements or failures reported by users. A common misconception is that any trait improvement guarantees universal benefits, but technologies often perform differently based on environmental factors. Evaluating these impacts requires weighing tradeoffs, such as enhanced drought tolerance versus planting constraints. Ultimately, evidence-based assessment helps determine if the benefits outweigh the drawbacks in specific contexts.

10

Researchers used CRISPR gene editing to change a tomato gene linked to softening so tomatoes stay firm longer after harvest. In shipping tests, edited tomatoes had 30% less bruising and lasted 6 more days before becoming too soft to sell. However, taste panels found no difference in sweetness, and some plants produced fewer seeds than unedited plants. What evidence shows a tradeoff in the impacts of this trait selection technology?

Less bruising and longer shelf life are benefits, while fewer seeds in some plants is a drawback, showing both positive and negative impacts.

The results prove that edited tomatoes will always be better for everyone in every environment.

Because sweetness did not change, the technology had no impact at all.

Tomatoes are red, so the gene edit must have worked perfectly with no drawbacks.

Explanation

The core skill is analyzing the impacts of trait selection technologies, like CRISPR gene editing in tomatoes, on product quality and plant reproduction. These technologies have impacts including extended shelf life but possible reductions in seed production. Evidence indicates benefits such as less bruising and longer firmness, with drawbacks like fewer seeds and no change in taste. A checking strategy is to compare edited and unedited plants in tests for multiple traits, not just the targeted one. People often misconceive that gene edits affect only the intended trait without side effects, but unintended changes can occur. Evaluating impacts involves recognizing tradeoffs between durability and reproductive output. Evidence is key to understanding if the technology's benefits justify its limitations.

Page 1 of 4