MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: B. 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: C. 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.
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Correct Answer: C. 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: 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. No definite conclusion about red buses follows.
Explanation:
The red vehicles might not be buses.
The information does not force any bus to be red or not red.
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Correct Answer: C. Some artists are not silent.
Explanation:
The artists who are singers cannot be silent.
Thus, some artists are not silent.
