MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: D. Speciation caused by geographic separation
Explanation:
A physical barrier reduces gene flow.
Separated populations may diverge into distinct species.
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Correct Answer: A. Speciation caused by geographic separation
Explanation:
A physical barrier reduces gene flow.
Separated populations may diverge into distinct species.
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Correct Answer: B. 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: 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. 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: A. 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. Structures sharing common ancestry despite different functions
Explanation:
Homologous structures reflect evolutionary relationships.
The vertebrate forelimb is a classic example.
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Correct Answer: B. Movement of alleles between populations through migration and reproduction
Explanation:
Gene flow can make populations more genetically similar.
It introduces alleles into receiving populations.
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Correct Answer: B. Structures sharing common ancestry despite different functions
Explanation:
Homologous structures reflect evolutionary relationships.
The vertebrate forelimb is a classic example.
Choose an option to check your answer.
Correct Answer: C. Movement of alleles between populations through migration and reproduction
Explanation:
Gene flow can make populations more genetically similar.
It introduces alleles into receiving populations.
Choose an option to check your answer.
Correct Answer: C. Structures sharing common ancestry despite different functions
Explanation:
Homologous structures reflect evolutionary relationships.
The vertebrate forelimb is a classic example.
Choose an option to check your answer.
Correct Answer: D. Movement of alleles between populations through migration and reproduction
Explanation:
Gene flow can make populations more genetically similar.
It introduces alleles into receiving populations.
