Question 1

Which of the following statements correctly describes homologous chromosomes in humans?

Accepted Answer

They are chromosomes that pair during meiosis, one inherited from each parent, and have the same genes but may have different alleles.

Question 2

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 3

What is the primary difference between chromatin and chromosomes?

Accepted Answer

Chromatin is unwound DNA found during interphase, while chromosomes are tightly packed DNA found during cell division.

Question 4

Which event occurs during metaphase of mitosis?

Accepted Answer

Chromosomes align at the metaphase plate and kinetochores attach to spindle fibers.

Question 5

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

Accepted Answer

46 chromosomes

Question 6

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

Accepted Answer

Crossing over during meiosis and independent assortment of chromosomes

Question 7

What is the function of the centromere during cell division?

Accepted Answer

It holds sister chromatids together until they are separated during anaphase.

Question 8

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

Accepted Answer

Autosomes are found in both males and females, while sex chromosomes determine gender.

Question 9

During which stage of mitosis do sister chromatids become individual chromosomes?

Accepted Answer

Anaphase

Question 10

A cell with 2n = 8 undergoes meiosis. How many chromosomes will each gamete contain?

Accepted Answer

4 chromosomes

Question 11

Which of the following equations correctly represents the number of possible gamete combinations due to independent assortment in humans?

Accepted Answer

$$2^{23}$$

Question 12

What is the result of crossing over during meiosis?

Accepted Answer

Homologous chromosomes exchange genetic material, increasing genetic diversity.

Question 13

Which structure is responsible for moving chromosomes during mitosis?

Accepted Answer

Mitotic spindle (microtubules)

Question 14

In plant cells, how does cytokinesis differ from animal cells?

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate.

Question 15

Which phase of the cell cycle is characterized by cell growth and preparation for DNA synthesis?

Accepted Answer

G$$_1$$ phase

Question 16

A mutation occurs at the locus for a gene on chromosome 7. What is the most likely consequence?

Accepted Answer

Only the homologous pair of chromosome 7 will carry the mutation.

Question 17

Which of the following best explains why prokaryotic cell division is simpler than eukaryotic cell division?

Accepted Answer

Prokaryotes have only one chromosome and lack a nucleus.

Question 18

During which stage of mitosis does the nuclear envelope reform and chromosomes decondense?

Accepted Answer

Telophase

Question 19

Which of the following is a real-world example of mitosis in action?

Accepted Answer

Healing of a skin wound through tissue renewal

Question 20

If a cell fails to attach its kinetochores to spindle fibers during metaphase, what is the most likely outcome?

Accepted Answer

The chromosomes may not be properly separated, leading to aneuploidy.

Chromosomes, Cell Cycle, and Cell Division: A Mini-Textbook Study Guide

Study Guide - Practice Questions