MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
Choose an option to check your answer.
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.
