Question 1

Which of the following best describes the main purpose of mitosis in multicellular organisms?

Accepted Answer

To produce identical diploid cells for growth, development, and repair

Question 2

During which stage of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 3

A human cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

$$46$$

Question 4

Which of the following events occurs during Prophase I of meiosis but NOT during prophase of mitosis?

Accepted Answer

Crossing over between homologous chromosomes

Question 5

If a diploid organism has a chromosome number of $$2n = 16$$, how many chromosomes will be present in each gamete after meiosis?

Accepted Answer

$$8$$

Question 6

Which of the following best explains why homologous chromosomes are not identical?

Accepted Answer

They have the same genes but may have different alleles

Question 7

A scientist observes a cell with chromosomes aligned at the metaphase plate, spindle fibers attached to kinetochores, and the nuclear envelope completely dissolved. Which stage is this cell in?

Accepted Answer

Metaphase

Question 8

Which process is responsible for the genetic variation observed in offspring produced by sexual reproduction?

Accepted Answer

Crossing over during meiosis

Question 9

In a karyotype analysis, a human cell is found to have 47 chromosomes, including three copies of chromosome 21. What is the most likely diagnosis?

Accepted Answer

Down syndrome

Question 10

Which of the following equations correctly represents the chromosome number change during meiosis in a diploid organism?

Accepted Answer

$$2n \rightarrow n$$

Question 11

A mutation prevents the formation of the cleavage furrow during animal cell division. What is the most likely outcome?

Accepted Answer

The cell will have two nuclei but remain as one cell

Question 12

Which of the following best describes the difference between autosomes and sex chromosomes in humans?

Accepted Answer

Autosomes are present in pairs in both sexes, while sex chromosomes differ between males and females

Question 13

Which of the following is a key difference between binary fission and mitosis?

Accepted Answer

Binary fission does not involve a nucleus, while mitosis does

Question 14

A cell in the testes undergoes meiosis. Which of the following best describes the resulting cells?

Accepted Answer

Four genetically unique haploid cells

Question 15

Which of the following best explains why meiosis takes longer in females than in males?

Accepted Answer

Meiosis in females pauses for years at Prophase I until ovulation

Question 16

Which of the following is true about the products of meiosis II?

Accepted Answer

Each cell contains a single set of chromosomes (haploid)

Question 17

A mutation occurs that prevents crossing over during meiosis. What is the most likely effect on the offspring?

Accepted Answer

Decreased genetic diversity

Question 18

Which of the following best describes cytokinesis in plant cells?

Accepted Answer

A cell plate forms to divide the cytoplasm

Question 19

Which of the following is the correct sequence of events in the cell cycle?

Accepted Answer

G1 → S → G2 → Mitosis → Cytokinesis

Question 20

Which of the following best explains why cancer cells divide uncontrollably?

Accepted Answer

They bypass normal cell cycle checkpoints

Mitosis and Meiosis: Cellular Division and Chromosome Dynamics

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