MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: A. Failure of chromosomes to separate normally
Explanation:
Nondisjunction can occur in meiosis or mitosis.
It produces cells with abnormal chromosome numbers.
Choose an option to check your answer.
Correct Answer: B. Exchange of DNA between nonsister chromatids of homologous chromosomes
Explanation:
Crossing over occurs during prophase I.
It produces new allele combinations.
Choose an option to check your answer.
Correct Answer: B. Failure of chromosomes to separate normally
Explanation:
Nondisjunction can occur in meiosis or mitosis.
It produces cells with abnormal chromosome numbers.
Choose an option to check your answer.
Correct Answer: C. Exchange of DNA between nonsister chromatids of homologous chromosomes
Explanation:
Crossing over occurs during prophase I.
It produces new allele combinations.
Choose an option to check your answer.
Correct Answer: C. Failure of chromosomes to separate normally
Explanation:
Nondisjunction can occur in meiosis or mitosis.
It produces cells with abnormal chromosome numbers.
Choose an option to check your answer.
Correct Answer: D. Exchange of DNA between nonsister chromatids of homologous chromosomes
Explanation:
Crossing over occurs during prophase I.
It produces new allele combinations.
Choose an option to check your answer.
Correct Answer: D. Reproduction involving one parent without gamete fusion
Explanation:
Asexual offspring are usually genetically similar to the parent.
Examples include binary fission, budding, and vegetative propagation.
Choose an option to check your answer.
Correct Answer: A. Homologous chromosomes
Explanation:
Homologous chromosome pairs move to opposite poles.
Sister chromatids remain joined.
Choose an option to check your answer.
Correct Answer: B. Homologous chromosomes
Explanation:
Homologous chromosome pairs move to opposite poles.
Sister chromatids remain joined.
Choose an option to check your answer.
Correct Answer: C. Homologous chromosomes
Explanation:
Homologous chromosome pairs move to opposite poles.
Sister chromatids remain joined.
Choose an option to check your answer.
Correct Answer: D. Division of the cytoplasm
Explanation:
Cytokinesis separates the parent cell into daughter cells.
Animal cells use a cleavage furrow, while plant cells form a cell plate.
Choose an option to check your answer.
Correct Answer: A. Cell division producing haploid gametes or spores
Explanation:
Meiosis includes two nuclear divisions after one DNA replication.
It reduces chromosome number and creates variation.
