AP Biology: Donor Source Pathogen Resistance Durability Practice Questions
Practice evaluating whether disease resistance in donor populations will remain effective after restoration among climate refugia. These original questions connect pathogen evolution and resistance breakdown to broad-spectrum resistance, diversified donor deployment, temporal sampling, and long-term fitness evidence.
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Answer the questions below — you get instant feedback and a full explanation for each.
1. What makes pathogen resistance in a restored donor population durable?
Explanation. Durable resistance remains effective despite environmental variation and pathogen evolution. It need not prevent all infection, but it should preserve host performance across relevant strains and over time.
2. Which experiment most directly tests whether pathogen evolution can erode resistance in a donor genotype?
Explanation. Serial passage allows pathogen populations to reproduce repeatedly on the resistant host. A consistent rise in infectivity or damage across independent lines would support adaptation to that host genotype.
3. Which field pattern is the clearest warning of resistance breakdown after an initially successful release?
Explanation. Resistance breakdown is supported when pathogen burden increases and the fitness advantage of the donor declines under comparable monitoring. Repeated observations help separate this signal from short-term environmental noise.
4. Which result provides the strongest evidence for broad-spectrum resistance?
Explanation. Broad-spectrum resistance acts against multiple pathogen genotypes. Replication, diverse strains, and simultaneous measurements of burden and fitness provide stronger evidence than a response to one isolate.
5. Why can diversified donor deployment reduce the risk of rapid resistance failure?
Explanation. When donors differ in resistance mechanisms, a pathogen adapted to one host genotype may transmit less effectively through others. Diversification reduces uniform selection and limits dependence on a single defense.
6. Which temporal sampling plan best detects a gradual change in resistance durability?
Explanation. Temporal sampling preserves the order of changes. Repeated pathogen and host measurements can reveal whether new pathogen variants precede higher burden and lower host fitness.
7. A rare pathogen genotype can infect donor A but transmits poorly on donors B and C. Which deployment would most likely slow its regional spread?
Explanation. A spatially diversified donor deployment can interrupt transmission by reducing continuous access to the pathogen's best host. Monitoring is still required because pathogen frequencies and host performance can change.
8. A pathogen mutation prevents recognition by a single host immune receptor. What outcome is most plausible?
Explanation. A defense relying on one recognition interaction can be vulnerable to a matching pathogen change. Whether the variant spreads also depends on transmission and any fitness cost associated with evading recognition.
9. Why might a donor with several partial defense mechanisms show more durable resistance than a donor with one highly effective mechanism?
Explanation. Multiple partial barriers can reduce pathogen success through different pathways. Overcoming them may require several changes, which can make complete resistance breakdown less likely or slower.
10. How can researchers test whether a diversified deployment changes pathogen evolution rather than merely lowering initial exposure?
Explanation. Replication, randomization, and standardized starting exposure separate deployment effects from initial conditions. Changes in pathogen genotype frequencies then provide evidence about evolutionary responses.
11. Which measurement best represents long-term fitness when comparing resistant donor sources?
Explanation. Long-term fitness integrates survival and reproductive contribution across the conditions the population actually experiences. A short-term disease score may miss delayed costs or later resistance failure.
12. Monitoring detects resistance breakdown in one donor but continued protection in two others. What is the most defensible adaptive response?
Explanation. Adaptive management should respond to measured failure without assuming that all mechanisms behave identically. Rebalancing the donor mix and continuing repeated sampling can protect function while testing whether pathogen evolution continues.
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FAQ
What is resistance durability?
Resistance durability is the persistence of useful protection across pathogen genotypes, environments, and generations. It is evaluated with repeated measures of pathogen burden and host fitness rather than a single exposure test.
Why can donor diversity slow resistance breakdown?
Donor genotypes may carry different defense mechanisms. A pathogen adapted to one donor may perform poorly on another, so mixtures or spatial mosaics can reduce uniform selection and transmission.
Why is temporal sampling important after restoration?
Repeated sampling can show whether pathogen genotype changes occur before increases in disease and losses of host fitness. That sequence is important when distinguishing evolution from temporary environmental variation.