Relate Variation to Selection Pressure - Biology
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Which scenario best illustrates sexual selection rather than natural selection for survival?
Which scenario best illustrates sexual selection rather than natural selection for survival?
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A trait increases mating success despite survival costs. Sexual selection can oppose survival-based natural selection.
A trait increases mating success despite survival costs. Sexual selection can oppose survival-based natural selection.
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Which statement best predicts allele frequency change if a phenotype has higher fitness?
Which statement best predicts allele frequency change if a phenotype has higher fitness?
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Alleles contributing to that phenotype tend to increase over generations. Higher fitness genotypes become more common over time.
Alleles contributing to that phenotype tend to increase over generations. Higher fitness genotypes become more common over time.
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Which option best explains why selection cannot produce a needed trait on demand?
Which option best explains why selection cannot produce a needed trait on demand?
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Selection acts only on existing heritable variation. Selection cannot create variation; it only filters what exists.
Selection acts only on existing heritable variation. Selection cannot create variation; it only filters what exists.
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Identify the correct interpretation if a new disease increases mortality in one genotype.
Identify the correct interpretation if a new disease increases mortality in one genotype.
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The disease is a selection pressure against that genotype. Disease creates differential survival based on genotype.
The disease is a selection pressure against that genotype. Disease creates differential survival based on genotype.
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Which outcome best indicates an adaptation rather than an acclimation?
Which outcome best indicates an adaptation rather than an acclimation?
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A heritable trait becomes more common across generations. Adaptation involves genetic change across generations.
A heritable trait becomes more common across generations. Adaptation involves genetic change across generations.
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What is the main requirement for natural selection to occur?
What is the main requirement for natural selection to occur?
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Heritable variation that affects fitness. Without heritable variation affecting fitness, no evolution occurs.
Heritable variation that affects fitness. Without heritable variation affecting fitness, no evolution occurs.
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What is the role of recombination in variation?
What is the role of recombination in variation?
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It reshuffles alleles, creating new genotype combinations. Sexual reproduction increases genetic diversity in offspring.
It reshuffles alleles, creating new genotype combinations. Sexual reproduction increases genetic diversity in offspring.
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What is the role of mutations in natural selection?
What is the role of mutations in natural selection?
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They create new alleles that can be acted on by selection. Without mutations, there would be no variation to select from.
They create new alleles that can be acted on by selection. Without mutations, there would be no variation to select from.
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What is adaptation?
What is adaptation?
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A heritable trait that increases fitness in a given environment. Adaptations evolve through natural selection over time.
A heritable trait that increases fitness in a given environment. Adaptations evolve through natural selection over time.
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What is a selection pressure in natural selection?
What is a selection pressure in natural selection?
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An environmental factor that affects survival or reproduction. These pressures determine which traits are advantageous.
An environmental factor that affects survival or reproduction. These pressures determine which traits are advantageous.
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What is genetic variation in a population?
What is genetic variation in a population?
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Heritable differences in DNA/alleles among individuals. This forms the raw material for natural selection to act upon.
Heritable differences in DNA/alleles among individuals. This forms the raw material for natural selection to act upon.
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Which scenario best illustrates sexual selection rather than natural selection for survival?
Which scenario best illustrates sexual selection rather than natural selection for survival?
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A trait increases mating success despite survival costs. Sexual selection can oppose survival-based natural selection.
A trait increases mating success despite survival costs. Sexual selection can oppose survival-based natural selection.
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Identify the most likely effect of a selective pressure that targets juveniles only.
Identify the most likely effect of a selective pressure that targets juveniles only.
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Traits improving juvenile survival increase in frequency. Early survival strongly impacts lifetime reproductive success.
Traits improving juvenile survival increase in frequency. Early survival strongly impacts lifetime reproductive success.
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Which statement best predicts allele frequency change if a phenotype has higher fitness?
Which statement best predicts allele frequency change if a phenotype has higher fitness?
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Alleles contributing to that phenotype tend to increase over generations. Higher fitness genotypes become more common over time.
Alleles contributing to that phenotype tend to increase over generations. Higher fitness genotypes become more common over time.
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Identify the best conclusion if two phenotypes have equal fitness in an environment.
Identify the best conclusion if two phenotypes have equal fitness in an environment.
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Selection does not favor either phenotype (no directional change). Equal fitness means no selective advantage for either form.
Selection does not favor either phenotype (no directional change). Equal fitness means no selective advantage for either form.
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Which outcome best indicates that a trait is heritable rather than purely environmental?
Which outcome best indicates that a trait is heritable rather than purely environmental?
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Offspring resemble parents for the trait across environments. Heritability shows genetic rather than environmental control.
Offspring resemble parents for the trait across environments. Heritability shows genetic rather than environmental control.
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What is antibiotic resistance an example of?
What is antibiotic resistance an example of?
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Natural selection favoring resistant bacterial variants. Antibiotics create strong directional selection pressure.
Natural selection favoring resistant bacterial variants. Antibiotics create strong directional selection pressure.
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Identify the correct statement about mutations and selection.
Identify the correct statement about mutations and selection.
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Mutations arise randomly; selection is nonrandom. Mutation provides variation; selection filters it non-randomly.
Mutations arise randomly; selection is nonrandom. Mutation provides variation; selection filters it non-randomly.
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What is meant by "selection is environment-dependent"?
What is meant by "selection is environment-dependent"?
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A trait can be beneficial in one environment and harmful in another. Fitness depends entirely on environmental context.
A trait can be beneficial in one environment and harmful in another. Fitness depends entirely on environmental context.
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What is the selective advantage of camouflage in many habitats?
What is the selective advantage of camouflage in many habitats?
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Reduced detection by predators or prey. Camouflage increases survival by avoiding detection.
Reduced detection by predators or prey. Camouflage increases survival by avoiding detection.
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What is an example of a biotic selection pressure?
What is an example of a biotic selection pressure?
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Predation (an interaction with other organisms). Biological interactions create complex selection pressures.
Predation (an interaction with other organisms). Biological interactions create complex selection pressures.
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What is an example of an abiotic selection pressure?
What is an example of an abiotic selection pressure?
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Temperature (a nonliving environmental factor). Physical environment creates selection without other organisms.
Temperature (a nonliving environmental factor). Physical environment creates selection without other organisms.
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What is meant by differential reproductive success?
What is meant by differential reproductive success?
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Some individuals leave more offspring than others. Fitness differences drive changes in allele frequencies.
Some individuals leave more offspring than others. Fitness differences drive changes in allele frequencies.
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Which statement best distinguishes natural selection from evolution?
Which statement best distinguishes natural selection from evolution?
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Selection is a mechanism; evolution is allele frequency change. Selection is the cause; evolution is the measured outcome.
Selection is a mechanism; evolution is allele frequency change. Selection is the cause; evolution is the measured outcome.
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What is meant by "trade-off" in adaptations?
What is meant by "trade-off" in adaptations?
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A trait increases fitness in one way but decreases it in another. Evolution often involves compromises between competing needs.
A trait increases fitness in one way but decreases it in another. Evolution often involves compromises between competing needs.
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Which option best defines "selective agent"?
Which option best defines "selective agent"?
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The specific factor (for example, predator) causing selection. The specific environmental force driving selection.
The specific factor (for example, predator) causing selection. The specific environmental force driving selection.
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What is the correct relationship between selection and variation?
What is the correct relationship between selection and variation?
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Selection filters existing heritable variation; it does not create it. Selection sorts existing variation; it doesn't generate novelty.
Selection filters existing heritable variation; it does not create it. Selection sorts existing variation; it doesn't generate novelty.
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Identify the most likely selective force when bacteria are exposed to an antibiotic.
Identify the most likely selective force when bacteria are exposed to an antibiotic.
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Antibiotic acts as a selection pressure favoring resistant cells. Antibiotics create directional selection for resistance.
Antibiotic acts as a selection pressure favoring resistant cells. Antibiotics create directional selection for resistance.
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Which condition must be true for selection to change allele frequencies?
Which condition must be true for selection to change allele frequencies?
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Trait variation must be heritable and affect fitness. Both conditions are necessary for evolutionary change.
Trait variation must be heritable and affect fitness. Both conditions are necessary for evolutionary change.
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Identify the correct inference if only the fastest prey survive predator attacks.
Identify the correct inference if only the fastest prey survive predator attacks.
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Selection favors alleles that increase speed. Speed becomes directly linked to survival and reproduction.
Selection favors alleles that increase speed. Speed becomes directly linked to survival and reproduction.
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