MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: D. Structures with similar function but different evolutionary origin
Explanation:
Analogous structures often arise through convergent evolution.
Bird and insect wings are examples.
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Correct Answer: A. Formation of new species
Explanation:
Speciation requires divergence and reproductive isolation.
It may occur with or without geographic separation.
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Correct Answer: A. Structures with similar function but different evolutionary origin
Explanation:
Analogous structures often arise through convergent evolution.
Bird and insect wings are examples.
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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.
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Correct Answer: B. 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.
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Correct Answer: C. 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.
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Correct Answer: D. Reduced genetic variation when a new population begins from few individuals
Explanation:
The founders carry only part of the source population's variation.
Their allele frequencies may differ by chance.
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Correct Answer: A. Reduced genetic variation when a new population begins from few individuals
Explanation:
The founders carry only part of the source population's variation.
Their allele frequencies may differ by chance.
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Correct Answer: B. Change in inherited characteristics of populations over generations
Explanation:
Evolution occurs at the population level across generations.
It is driven by mutation, selection, drift, and gene flow.
