MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: C. Independent evolution of similar traits in unrelated groups
Explanation:
Similar environments can favor similar adaptations.
The resulting structures are often analogous.
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Correct Answer: D. Differential survival and reproduction based on heritable variation
Explanation:
Individuals with advantageous heritable traits may leave more offspring.
Trait frequencies can therefore change.
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Correct Answer: D. Sharp reduction in population size that alters genetic variation
Explanation:
A bottleneck leaves a small surviving gene pool.
Rare alleles may be lost by chance.
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Correct Answer: A. Differential survival and reproduction based on heritable variation
Explanation:
Individuals with advantageous heritable traits may leave more offspring.
Trait frequencies can therefore change.
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Correct Answer: B. Differential survival and reproduction based on heritable variation
Explanation:
Individuals with advantageous heritable traits may leave more offspring.
Trait frequencies can therefore change.
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Correct Answer: C. A heritable feature increasing fitness in a particular environment
Explanation:
Adaptations arise through natural selection acting on variation.
Their usefulness depends on environmental conditions.
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Correct Answer: D. A heritable feature increasing fitness in a particular environment
Explanation:
Adaptations arise through natural selection acting on variation.
Their usefulness depends on environmental conditions.
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Correct Answer: A. A heritable feature increasing fitness in a particular environment
Explanation:
Adaptations arise through natural selection acting on variation.
Their usefulness depends on environmental conditions.
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Correct Answer: B. Relative reproductive success
Explanation:
Fitness measures contribution of genes to future generations.
Survival matters mainly through its effect on reproduction.
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Correct Answer: C. Relative reproductive success
Explanation:
Fitness measures contribution of genes to future generations.
Survival matters mainly through its effect on reproduction.
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Correct Answer: D. Relative reproductive success
Explanation:
Fitness measures contribution of genes to future generations.
Survival matters mainly through its effect on reproduction.
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Correct Answer: A. Random change in allele frequencies, especially in small populations
Explanation:
Genetic drift can fix or eliminate alleles by chance.
Its effects are strongest in small populations.
