MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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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.
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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. 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.
