Question 1

Which of the following best describes the difference between haploid and diploid cells in humans?

Accepted Answer

Diploid cells contain two sets of chromosomes (2n), while haploid cells contain one set (n).

Question 2

During which phase of the cell cycle does chromosome replication begin, and what is the result?

Accepted Answer

Chromosome replication begins in the S phase, resulting in duplicated chromosomes attached at the centromere.

Question 3

If a human somatic cell undergoes mitosis, how many chromosomes will each daughter cell contain?

Accepted Answer

Each daughter cell will contain 46 chromosomes.

Question 4

Which structure is the site of attachment for spindle microtubules during cell division?

Accepted Answer

Kinetochore

Question 5

A cell in metaphase of mitosis has 46 replicated chromosomes lined up at the equator. How many individual chromatids are present at this stage?

Accepted Answer

$$92$$

Question 6

Which of the following correctly describes homologous chromosomes?

Accepted Answer

They are chromosomes inherited from each parent that have genes for the same traits at the same loci.

Question 7

During meiosis I, what is the significance of the formation of tetrads?

Accepted Answer

Tetrads facilitate crossing over, increasing genetic diversity.

Question 8

After meiosis II is complete, how many haploid cells are produced from one original diploid cell?

Accepted Answer

$$4$$

Question 9

Which phase of mitosis is characterized by the chromosomes condensing and the nuclear envelope breaking up?

Accepted Answer

Prophase

Question 10

A genetic disorder causes errors in kinetochore formation. Which process would be most directly affected?

Accepted Answer

Attachment of spindle microtubules to chromosomes during cell division

Question 11

Which equation correctly represents the chromosome number in a human zygote after fertilization?

Accepted Answer

$$n + n = 2n$$

Question 12

During anaphase of mitosis, what event occurs to ensure each daughter cell receives the correct number of chromosomes?

Accepted Answer

Sister chromatids are separated and pulled to opposite poles by spindle microtubules.

Question 13

Which of the following is TRUE regarding the outcome of meiosis I?

Accepted Answer

Two haploid cells are produced, each with 23 replicated chromosomes.

Question 14

A patient’s somatic cells are found to have 23 chromosomes instead of 46. Which process most likely failed during development?

Accepted Answer

Mitosis

Question 15

Which phase of the cell cycle is responsible for the production of enzymes and other proteins needed for cell division?

Accepted Answer

G2 phase

Question 16

If a mutation prevents the formation of spindle fibers, which stage of mitosis would be directly affected?

Accepted Answer

Metaphase

Question 17

Which of the following best explains why meiosis is necessary for sexual reproduction?

Accepted Answer

It reduces the chromosome number by half, ensuring offspring have the correct diploid number.

Question 18

During meiosis II, what is the main event that distinguishes it from meiosis I?

Accepted Answer

Separation of sister chromatids

Question 19

A cell is observed to have spindle microtubules attached to kinetochores and chromosomes lined up at the equator. Which phase is this cell in?

Accepted Answer

Metaphase

Question 20

Which of the following is a direct result of crossing over during meiosis?

Accepted Answer

Increased genetic variation among gametes

Cell Division: Chromosome Content, Cell Cycle, Mitosis, and Meiosis

Study Guide - Practice Questions